 I understand all that you are on. I cannot take Allegra D. I took it and it was the BEST thing in the world for me and my allergies.....but it started causing me a rare side effect. I thought I was having a heart attack. Took a lot of tests and dr visits to figure out what was causing the problems and I cannot take Allegra D. I can take sudafed (the old kind and the new kind, but the new kind does not work on me). I can take Mucinex D. No problems. So when I get pressure in my head, or stuffy, or my ear hurts, I need a decongestant and usually take sudafed or mucinex D. If I am itchy, sneezy etc. I take benadryl.
I have taken benadryl while on the phendimetrizine and not had any problems. But the doctor had thought if I combined a decongestant while taking phendijmetrizine that it could raise my blood pressure. My bp is running normal even on the phendimetrizine. Under 120/80. Usually 110/72. My heart rate goes up and down a bit more....
Anyway. I can understand you Susan! I have tried all the things you take  You have to go with what works. I don't know what I will do if I get older and get high blood pressure and cannot take a decongestant! 
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