Hi xixjadexix, welcome.
I think you've already tried most of the
antispasmodics except carisoprodol (Soma). I don't understand your doctor's "too old" pretext, but AFAIK, the others he's tried you on are probably stronger (there are always exceptions, as everyone is different).
http://en.wikipedia.org/wiki/Category:Antispasmodics
Are you in a location where medical cannabis is legal for this purpose?
Doc