I just had a Google for you and there seems to be a lot of people who are having rebound effects from suddenly stopping higher dose long-term beta blockers. They seem to be suffering between 2 weeks to over 6 months, due to the drug blocking adrenal receptors which then goes haywire when you stop.
The women on one forum were mentioning MS like symptoms and were advising each other to gradually lower the dose over the course of 6 months, although you would still get some symptoms until everything goes back to normal. As you suddenly stopped yours, it has possibly set off this severe rebound withdrawal effect. They seemed to think that GPs were not well informed on how severe withdrawal can be.
Sometimes the right Googling can help you rather than worry you. If you put something like I did in 'beta blocker rebound how long' you will see the same sites and discussions.
If you do go back on them after your appointment you're waiting for then this will no doubt stop/reduce the symptoms, otherwise you could ask the GP to let you have a low dose to gradually reduce, because you are possibly experiencing quite severe withdrawal effects - just say you know others who have if they try to dismiss this.
Adrenal symptoms can be varied with anxiety rushes, twitches and shaking, and can also be a meno symptom due to the low oestrogen causing excess adrenaline to compensate, and high oestrogen in peri causing it as a direct effect. However, yours may be more to do with the BBs going by the other experiences I've just read about.
Dangermouse, I have had a look at some sites thanks. I have now frightened myself to death as it's obvious that what I have been experiencing has been withdrawal from the BBs. I am so angry and upset that both my GP who I trusted the pharmacist both said that because my dose was supposedly a low one I wouldn't have any problems just stooping them instead of tapering at least. I feel I can't trust anyone now and fear that I may have caused damage to my heart because of the shock I've given it by suddenly stopping a tablet that it has relied on for 20 years. It says you can have heart attacks and all sorts. I'm totally confused now as to whether I should re-start them and wouldn't now trust the dr's. This sort of scenario is exactly why I have health anxiety!!! Been here many times and now I'm very upset.