Accent symptoms and conditions

I went to the dermatologist and was diagnosed with a severe case of hives/rash. Has anyone ever been prescribed Singulair in combination with Xyzal for hives? He also prescribed Tagamet for the stomach problems apparently these two drugs can cause. I am very afraid to take this but talked to two different doctors that are telling me to take my medicine and are getting angry at me for not wanting to take it an are getting impatient with me for being scared about it and asking questions. I was also prescribed a Lidex cream that has steroids in it even after telling the doctor that I just got off Prednisone for a sinus infection last month and had a really bad reaction to the Prednisone (steroid). He still gave me the steroid cream and said "this is a topical you won't have any side effects with this and your reaction couldn't possibly have been from the Prednisone, it had to be from the antibiotic" If anyone has heard of or taken the combination of Xyzal and Singulair for hives or skin problems please post me a response before I go get these prescriptions filled. All four of these will cost me almost $100 because the Xyzal is $40 and the Singulair is $25, they do not offer a generic for these two money makers. I have insurance and still will cost me a hundred for all four (steroid cream and Tagamet as well). Please someone let me know about this combo and if you have been given for hives as well. I don't know why I am given the Singulair at all. It causes hives in some people from what I have been reading. I can see the Xyzal because it is an antihistamine, that's fine but the Singulair seems to be a cause of hives. Doctor mentioned something about H1 and H2 inhibitors or something but said it so fast and speaks with such an accent I couldn't understand what he was trying to tell me. Please help before I get really bad reaction and have to go to ER like last month with the Prednisone. Thank you and God Bless.