Levitra?

I feel fine taking Viagra, but feel F'ING TERRIBLE when I take Cialis. It's the reason why I won't take it anymore. I get massive leg cramps, my lower back aches and this general feeling of malaise for days, just downright awful! The dose I take does NOT matter. I can take 5mgs and still experience the same feelings.

Have NEVER taken Levitra before, but I wanted to try it out. Does anyone know if Levitra causes the same feelings like that of Cialis? Has ANYONE here that has used Levitra felt "bad" while on it?

Any help would be greatly appreciated.