I have switched to a toothpaste that doesn't contain sodium laureth sulfate (SLS) and cannot believe the improvement in my oral symptoms.
I haven't had a proper mouth ulcer for ages.
My constant sore throat has gone.
My constant tender lymph nodes under the jaw have gone.
My constant oral thrush is gone.
Obviously, your ulcers are likely to be disease-related, and a switch in personal care products is unlikely to cure you, but it's possible it might help.
This is the toothpaste I use:
http://www.langtoninfo.co.uk/showitem.aspx?isbn=4001638098045&loc=AUDSalty gargles might help too.
Much sympathy to you. Those symptoms are so hard to put up with, especially when you have to deal with both bottom and top at once :-(.
Ivy.