I've taken inderal in the past and the symptoms will scare the crap out of you, but mine subsided after about 2 1/2 weeks. It did seem to help my anxiety for a while but I was taken off of it because it eventually stopped working so we switched to something else. My advice to you would be to candidly discuss it with your doctor, considering your underlying history and don't go back to websites unless you are really having some serious side effects that are very disconcerting or will not go away (then again, your doctor is the best advice you can get).
I know it can scare you but keep in mind the amount of people taking the drug with no problems, far out weigh the ones with problems. I checked out the link you provided, and can see why you are scared....now I am too! I've been on it for many years with no problems, and it has great reviews. I know it can take 6 weeks for your body to adjust to it, so you need to be patient. I have benefitted greatly from taking it and know others who have also. I think if we checked out every drug we take, we'd throw them all in the garbage. But some people will have an adverse reaction, and I noticed that on the website either the people were very old or taking other drugs which may have not mixed well. It's been around for a very long time, so I think you're okay. I'm not going to stop taking mine. Take care...