I have also suffered from this on and off for a number of years. Going through an episode now which is a first for a long time - had a panic attack this morning, but have gotten over it and feel able to cope with the day now. Mine was triggered by an episode on holiday, where I sat down to a meal, and couldnt face eating, (looking back think I had touch of heatstroke) but at the time this triggered a huge panic attack where I genuinely thought I was dying, lay on the toilet floor in a sweating heap - the most frightening time of my life .
This then escalated into a fear of eating in public and also, going on holiday - which lasted for around 5 years. Holidays were literally torture - as you say it is the anticipation of an attack and the anxiety that this generates that is the worst - the constant over-whelming fear that something terrible is going to happen.
I went to my GP's who were helpful and I was referred for couselling which I found OK.
I think tbh I helped myself. I read loads about the subject, and once I realised what a panic attack was, this helped hugely as I realised I wasnt going to die, I would feel absolutely awful for about 10-15 minutes but it WOULD pass, I had coped with it before, and I could cope with it again. With regard to the anxiety, I try to think, "whats the worst that could happen?" in my case, it would be having a panic attack in full public view, and possibly being sick in public, however, if I rationalise this I think, well, really, in the grand scheme of things is that really so bad?? Could be embarassing, but it's over quite quickly, and you can move on.
I think accepting you have an issue is also important - I try not to think, oh god, why am I like this? why me? and I try not to fight it too much, iyswim, I just think, well, this is "my thing" - most people you speak to have a fear of something, and I suppose when I think of the terrible things some people endure I kind of try and think well, my "thing" isnt the worst, I can manage it.
In saying all of the above, I dont think this ever really leaves you, I would have said last week I was fine, but over weekend I have felt rotten again, (d & v triggers this, as does feeling down), but even just writing this has made me feel a bit more positive.
You will manage it, but I think as I said above acceptance is a big part of it, I really hope you feel better now. Try and take one day at a time, if that is too much, an hour at a time, it WILL pass.