I suffer pretty badly with indigestion and acid reflux, so I can empathise. I also take a fair few painkillers for my arthritis and a dodgy shoulder that's connected in a roundabout way to my bad hip. Anti-inflammatories are usually what's prescribed for arthritis, so I've taken almost all the painkillers in that family at some point
It's very true that ibuprofen based tablets can be bad for your stomach, even if you don't have an ulcer or somesuch, they can irritate the lining. My dad took them for years, and eventually ended up with internal bleeding - obviously that is from years of repeated daily use, so don't panic, but it just shows the effect they can have. If you still need painkillers, definitely switch to co-codamol or something in the paracetomol family instead from now on.
As for gastric problems, I doubt I have any advice that's beyond what you already know from googling - eat slowly, chew thoroughly, don't eat standing up, don't lie down immediately after food. Alas, you probably need to be eating fairly light and staying mainly on the protein side of things, at least for a while! I'm not 100% sure if those symptoms are related to stomach acid - it might be worth going to the doctor and asking if they are, cos if so they could put you on a course of omeprazole. I've had that twice, once after the pain was so bad that I couldn't keep anything down and lost 5lbs in a weekend, and another time when it was just a daily long-term annoyance. Both times it cleared it up.
So yeah, I suspect it's time to see a doctor. I know what you mean about feeling like a hypochondriac - when I had a constant cold and cough last winter, I think I was there four times in as many months! But it's gotta be done. And presumably they'll be able to give you something for the rash too. I'm assuming you're using hydrocortisone cream already - I have psoriasis, but as that doesn't itch, I have no experience in treating virus rashes. Ha, a health problem I don't have