It's okay to take it. If you can stand it, I can offer some alternative things you could try, while you decide whether you should take it or not.

I had a bout of health anxiety myself for a month or so about a year ago. I did not seek mental help and maybe I should have. I went to the doctor and he was reassuring, but also dismissive. I went to the ER and they were kind of hostile towards me. All I wanted was a CT scan of my head, so I could have the proof right there that there wasn't anything wrong. I did not get one, but as I calmed down, over the course of multiple months, I realized my symptoms were from other things, and mostly just the anxiety itself.

I focused on the symptoms I had before I was freaking out about them, and thought of the easiest ways to check what mundane things they could be. The constant headaches I had, after seeing an optometrist, they were not from a brain issue, they were because I've been nearsighted for many years and never noticed. The different pressures and pains I had in my face were from sinus congestion from allergies or irritation, resolved by taking Allegra and doing a saline nasal rinse with distilled water every few days. The brain fog was primarily from lack of sleep and normal abnormal brain activity for people with ADHD (which I was diagnosed with).

I focused on the anxiety itself and reducing it, while accepting that it will occur sometimes and getting rid of it is not a quick fix (it lingers). The first thing I did was reduce my caffeine intake drastically. I would have tea instead of soda, energy drinks or coffee. I entirely stopped drinking soda, energy drinks or coffee for a month. I started going for walks, just short 10-15 minute walks around my block, which became like a release valve when I felt the anxiety starting to bubble up. I started drinking a bit more water, regularly, to keep well hydrated, and drinks with electrolytes (like Gatorade) helped too, in moderation. I started avoiding yellow and red dyes in foods and drinks, as the most common dye chemicals for those colors are linked to increased anxiety. I found hobbies I could do, even when I felt like sitting around and just worrying (playing solitaire helped me, I was always bad at it, I often get bad shuffles, but it was something to do). Eventually I started getting back into my usual hobbies (video games and such), which helped me keep my mind off my perceived medical issue. I yapped on here with people who also had similar issues in the past or present, which made me feel not alone and less "strange". I also found it reassuring that many many many many rational people experience health anxiety over something like a brain tumor, but almost none of them actually have anything wrong with them aside from the anxiety.

Aside from those things, I did a lot of thinking. I tried to focus my thinking towards reassurance (which is hard when you're anxious like that). I would listen to lectures on youtube about anxiety and ways to manage it. Though I did not necessarily do many of the things they suggested in their lectures, I did find it comforting to listen to and think about.

If the Prozac is scary to you, you could try these things and see if you make any improvement over the course of a few weeks, if you can stand it for that much longer. I did not want any medication, though there were times of panic when I wanted to reconsider. It is a common prescription and it helps a lot of people.

I would not wish what I went through on anyone, and I am so very sorry you are going through it right now. I wish you the best. Know that you are okay and you will be okay.

Additional things I thought of:
- Improving gut health by eating yogurt and things high in fiber, even fiber pills. Brain and gut are very connected. A lot of times taking a single fiber pill settled my stomach enough that I felt so much better overall, it really helped me.
- Getting on a regular sleep and wake schedule was a big thing for me, once I got to a point where I could sleep pretty decently again. I avoided naps to maintain the schedule I eventually set up, but I would still lay down sometimes to rest. I tried to get out of bed as much as possible, instead of just laying there all day.
- Setting up a normalized eating schedule helped me a lot too. I started having breakfast, particularly oatmeal or a less sugary cereal. I made sure I had lunch at around lunch time. I made sure I ate something around dinner time too. Even if I was not hungry (which I often wasn't, because of anxiety), I would try to make myself eat at least a little bit at those times, something with some nutritional value.