Typically, ulcers are caused by a bacteria, not a virus, and that's why antibiotics are effective. They don't help with a virus.
Don't fool around when you're spraying solvent based paints.
Twenty five years ago, I inhaled some Woodlife, a wood sealer and preservative, that I was spraying on wood door jambs before the plasterers started, to keep the water from making the wood swell and warp. The penta-something in the Woodlife got into my bloodstream, and lowered the blood-brain barrier that we all have that protects our brains and spinal cords from the nasties that swim around in our blood. A virus penetrated my spinal cord, and I woke up numb from the bottom of my feet to my, er, water spout. I found out when I went for my morning pee.
I wound up in the hospital, they thought it was MS, finally figured out it was a "transient virus" that had gotten into my spinal column and damaged the nerve lining.
I have permanent nerve damage from it. Although the nerves did regenerate quite a bit, I still have a feeling like my fingers have cotton balls stuck between them. But, for a long time, I couldn't tell what I was holding in my hands without looking. Scary for a carpenter.
My friend was doing custom paint jobs on hoods for a sheet metal shop where he worked. He was using automotive paints for their durability. He didn't wear any kind of protection, wound up with fatal cancer.
Chemicals are nothing to take lightly. And being young doesn't make you immune to their harmful effects.
This rant is really saying, be careful.