Is Taking Diphenhydramine Safe To Treat Glaucoma?

I need an opthalmologist, please? Question - about 2 1/2 weeks ago diagnosed with glaucoma, I believe the open angle type; anyway, doctor prescribed drops to see if that works, Latanoprost Opthalmic Solution 0.005%. Is that a common drop given and what s the success rate on treating glaucoma over the years? He s been my opthalmologist for over four years now.I am wondering if taking OTC antihistamine called Diphenhydramine HCI 25mg is safe knowing I now have glaucoma?Please respond with my answer.Thank you very much!I tried calling the doctor s office but staff was gone for the weekend already and, also, called the local pharmacist at Walgreen s; he suggested I STOP taking the antihistamine. I am surprised my doctor s staff didn t suggest stopping it since they should know I have allergies, and have had allergies for some years now. They ve changed some over the years and now I have allergic reactions to tree pollens.Thank you so much for your time and assistance.Sincerely,Debbie