Hi mate, firstly I am glad you have realised that you are not alone. I do not have experience of the blood pressure tablets, however I am now 38 and have had experience of depression, panic attacks and anxiety on and off from about 16 years old. The advice about speaking to your G.P. is only good if he/she is a good doctor, or it can be counter productive. Most G.P.s even the good ones have a limited knowledge in these mental health related areas and certainly what impact certain medication has on an individual. The good news is that there is plenty of good information out there online, books and C.D.s. As has been alluded to by another member, there is an element of trial and error, but I have no doubt you will find the right combination of medication, lifestyle and most importantly your thinking as you have no reason to feel ashamed or stigmatised. How we think is linked to C.B.T. Cognative behavioural therapy, the idea being that if we change how we think, it follows that we change how we feel and behave also.
In summary, try not to be too critical of yourself, take your time to breathe and find balance, peace and ultimately joy in your life once again, know that you are not alone and that things can and will improve. All the best, Stephen.