For a couple days now I've had very intense chronic anxiety where I'm constantly nervous that I'm dying to heart disease, cancer or some other form of horrible illness. I've been nearly completely unable to sleep due to everything. I was like this for about a week previously but the matter eventually resolved itself and I felt perfectly normal again for quite a few days.

That was until recently where I drunk far too much alcohol and had an abysmal hangover which seems like it hasn't ended for days; heavy depersonalisation and all, probably due to me hyperanalysing every symptom and intensifying it with my own mind. I have so many tangible and very real symptoms from a feverish feeling to tension in my head and it's hard to believe they're psychosomatic.

I want this persistent fear to end so badly but I'm worried that the relief offered by diazepam will then make me feel even worse later on. I'm also scared that it just won't help, and I have to face the fact my symptoms aren't going anywhere. 

Propranolol is somewhat similar in that I have significant concerns over the health of my heart and the prospect of a medication that will slow my BPM is pretty alarming. I keep thinking my heart beat is weak due to me not being able to feel it well, and that it'll be shut down.

I guess I'm seeking reassurance or at least other experiences regarding these two medications. I want to know whether I'm torturing myself unnecessarily or if these could do some real work for me.