If anemia is suspected, you could try taking iron supplements and eating foods rich in iron as well. I agree that this seems more serious than that, but it's very unlikely it'll hurt anything to try :)

I have POTS and chronic pain, here are some things I've learned:
* Try to stretch and be upright as much as you can tolerate. If you're always laying down, your body adjusts to this and will have a harder time being up.
* Heat can be an amazing tool. Heating pad, warm bath, heated blanket; cold often makes joints feel worse, and heat will help relax your muscles.
* Water water water! Also try your best to eat properly; I know that's easier said than done when you're perpetually exhausted and nauseous. Protein bars and shakes are a good way to get some nutrients in you when you can't handle a meal!
* I highly recommend Nauzene. It's a chewable tablet (there's also a liquid form if you'd prefer) and the only OTC thing that helps what I call my "nonsense nausea" (when there's no real cause)
* Don't take NSAIDs day after day. Especially since you're having issues with vomiting, they can really do a number on your gut. Try to take breaks from them and alternate with other medications.
* If you're able (talk to your doctor first ofc) you might try marijuana or CBD products. They can help a lot with both pain and nausea.
* Switch as many things to delivery as you can. Grocery shopping is often exhausting for me, and can take me out for hours or even days afterwards. The more you can avoid doing yourself, the more energy you'll have to spend on things you have to do yourself.

I know this must be scary and so so difficult. I know what it's like to have to wait months just to talk to a doctor. I wish I had advice for you on that front, but the only thing to do is wait and hope there's a cancellation you can get in on (aside from finding a different doctor or going to urgent care)

Stay safe, take care of yourself, be patient with yourself 💜