Do i need urgent medical attention?

Right okay, Its probably not urgent but here it goes.. During the last year i have been diagnosed with anxiety, i'm on 3 different types of medication: Mirtazapine, diazepam and propranolol. This combo has worked over recent times and i find it a good combination to help me through times. The propranolol has been for my fast heart rate and like 99% works a treat, but for about 4 days now i have had an extremely tight chest, my heart rate seems to be fluctuating between 130-170 bpm; to me this resembles a normal but not quite frequent panic attack.. but the scare came when i just took my dose of propranolol and diazepam and about 20 minutes later my right eye lost vision and my body felt numb, like completly numb i got such a surge of adrenaline i hoped out of my chair and and fell straight to the floor, heart racing and a hallucination so scary i seriously cant take this medication again. making my way to the phone to dial 999 i heard a voice in my head screaming not to phone its a waste of time, and no matter how i try i seriously cant do it and when someone asks if i'm okay i cant help but say im fine when quite clearly i'm in so much panic. I am training and doing a university degree in psychology and never have i crossed something like this since studying. it has all the symptoms of a panic attack, but ive experienced panic attack so bad ive passed out and so forth, so this seems much different. Typing this im calming down again but i feel it will happen again. is this something to be concerned about? P.S i also studied medicine for about 6 months, and the likely candidate for this could be a paradoxal effect of the diazepam/mirtazapine. but i cant help still imagining it happening again.