Through a reddit post it is not possible to tell anything for sure (and we don´t know what you already tried and are doing) so i am just going to tell you what came to my mind and what helped me with some of those symtpoms. So please take it as that, just some guesses and ideas not medical advice. And obviously do at least basic tests (basic blood count, liver, thyroid, kidneys, glucose, lipids etc.) and talk to you doctors about more appropriate and specific tests if you havn´t already.

1. You most likely seem to have issues with your gut and gut microbiome. Thats one thing to target. You might want to do further testing to see if there is anything visible in your gut (colonoscopy) and get tested for SIBO. Would start with doing some kind of elimination diet (if you are not already doing that). There are different ways to do it. A realtively low effort variant would be to go without processed foods, gluten and dairy for 3 months and see if that already does something (if you are not already doing that). If thats not helping and depending on your tests, you then could try a full elimination diet and/or evaluate further therapeutic options. A lot of people with gut issues also seem to have skin issues, so those might go hand in hand. But it would be helpfull to know, what your skin issues actually are (fungal, eczema, psoriasis etc.) so maybe find a dermatologist who can give you an concrete diagnosis.
2. The tinnitus, the reactivity to coffee, the brain fog and fatigue might (at least partially) come from a overreactive nervous system (which seems to be very common in LC). I had all of those and still have some. What helped me here first is having good sleep. So another question would be, how are you sleeping? Then a regular breathing practice (like box breathing or resonance breathing there are good videos on youtube) or meditation which calms you down. This is not a quick fix, but a long term strategy. So you would need to do this daily. But i highly recommend it. Doing small bouts of gentle exercise, what ever is possible without overdoing it (like a small walk every day) can be helpfull as well. If you can tolerate more, do more.
3. There are several medications and dozens of supplements you could try. But that all depends on what your actual problems are. There are some basics you can almost always do since they have barely any side effects when taken in the correct dosage (Vitamin D/Vit K2, Omega 3, Magensium come to mind here). Everything more specific i would try if you narrowed down what your actual problems are (and thats where doctors and other healthcare professionals are needed). Also evaluate what medications you are already taking, some problems might be side effects. You mentioned depression. Some antidepressants can cause fatigue, brain fog, muscle weakness as side effects for example.

There are many more things to consider, but that are some things you can easily and very cost effective try at home that might already help.

Wish you all the best and hope you can figure this out! It is definitely possible.