Please help suspected ulcers and getting queasy to most foods

Hi everyone,
I have been looking for a support forum for ulcers, glad I found this.
A month ago, I took Advil the entire month for unrelenting fever/flu/cold.
I was put on tetracycline. By the end of my tetracycline course, I had developed lots of burning and churning. I also got a yeast infection. I started getting REALLY sick and queasy with my favorite foods. Simple foods like potatoes, beef, chicken, cauliflower, broccoli etc etc. The list goes on. I am down to tolerating only rice and some beans.
No docs helped initially - I tried to get an upper gastroscopy done - but to no avail, even after spending 7 hrs in hospital, they just sent me home.
I understand that I may very likely have an ulcer and now on my own, have booked an upper endoscope for this Friday.
Problem is that I've lost so much weight and it feels like I'm allergic to all other foods besides rice and beans.
Does anyone have experience with this? It does not seem to be my gut, but rather the way my body now reacts to specific foods.
Yesterday after eating it last week just fine, broccoli made me so queasy and feel like vomiting for about 2-3 hrs until it passes.
I am taking Prevacid 30mg 2x day for 2 weeks now (it did stop the intense burning pain and cramping) and I'm taking 1-2 gms of l-glutamine for about 2 weeks also.

How long does it take for ulcers to heal?
But most importantly, does anyone have experience with this kind of stomach sickness to almost every food?
I am afraid I'll never be able to eat them again, does this reverse after healing?
Oh, also I should mention that because of the food reactions that feel like allergic reactions, I started a high protease enzyme when all this was developing. I came to realise through reading that this can further cause damage!!

Any help from those with experience and any encouraging words would be greatly appreciated. I'm a single mom, with a 4 yr old, unable to work lately, lots of worries for my health and trying so hard to be healthy.
I am negative for H. pylori, this seems to be induced by medicine.
Oh one more thing, I cannot swallow pills so I had to take the tetracycline out of the capsule and swallow it with water.
For my diet before this started, I do not eat dairy and cannot eat fruit (fructose)

Thank you for any help and encouraging words, I have no experience with this and I am scared. Most docs brush this off, but one last week literally tried to terrify me and I thought that was very cruel of him.

Thank you.