Ouch, I feel for you. I hate those ulcers, but they usually go away in a week or two, and yes, you have to change the diet a little too (I love spicy food too, we have a lot here also). Salt water will just clean the area,
Honestly, if you can't go to a doctor, I'd suggest asking at a good pharmacy for what you might use for it - here they know what to use for most common things like this, just ask what you might require.
I don't recall if creams help them go away quicker or just numb the pain a bit, but you don't have many choices - and if it is what you say, I don't think a doctor could do much more than prescribe similar anyway. Basic painkillers might help too. The earlier you check the earlier you'll start to heal. Asking without need for doctor shouldn't cost anything, and you shouldn't need anything signed by doctor for medications.