I feel for ya, I went through years of that shit, though it's mostly over now, just a little background anxiety going on. Things I would tell myself if I could go back in time to when they first started happening would be:
1. Cut as much sugar out of your diet as you can, that includes soda. The post sugar rush crash can trigger anxiety feelings or leave you feeling wired. ditto caffeine and alcohol.
2. Eat when you are hungry, for some reason I would delay eating and misinterpret the hunger as anxiety.
3.Even though it really really really fucking feels like it those sensations do not mean you are going to die/go crazy/have a stroke/collapse/[insert other catastrophic event here]
4. Having this shit happen means fuck all about you, your life, your character or your future, your body is just overeacting to stress and will take it's time to re-calibrate, help it do this by learning to relax, exercising and modifying your diet.
5. Don't take the meds they will fuck with your emotions making it harder to distinguish between what is your feelings and what is the meds.
6. Do some form of exercise daily - I personally prefer chi kung but yoga would be good too. Something that causes you to stretch and relax your muscles so that you can become aware of when you are tense and do something about it. If you do chi kung exercises DO NOT TOUCH YOURSELF AFTERWARDS as you will just be putting the bad chi back in your body (ie dont hold your stomach or rub your head like most systems say to do), instead shake your hands like shaking water off them and imagine it going into the ground.
7. Take timeout when you need to, that means going for walks, getting outside the city, being alone for a while (though don't isolate yourself or use it as a coping mechanism).
8. Don't worry so much about other people and their needs. They are capable of taking care of themselves and learning to accept no is good for them.
9.Find out what you enjoy and do it daily, if you are working a lot then schedule in pleasurable activities - watching a movie, playing pool with friends, skyping a mate, video games, dancing, whatever you like doing.
10.Learn dancing or something physical that takes your total focus. A racing mind can exasperate anxiety so doing something that puts your attention into your body and forces you to be in the now will take you out of your thoughts and lessen your anxiety sensations.
11. If you are in a shitty situation that is making things worse, get out of it, drop the client, quit the job, break the relationship, have the conversation. What ever it is that makes you feel in a catch 22 just do it, the consequences are far far less than your mind is telling you and the positives are huge, staying where you are is not an option.
12. Be kind to yourself and realise things can take time, there is no rush.
13. Learn to accept a slower pace of life for a while.
I hope that helps