Websites and numbers that I have found to be useful (or not so much!)

http://costohope.blogspot.co.uk

This wesbite is specifically to do with costochondritis and helps to calm those with scary symptoms and chest pain. Very well written and useful if you have chest pain that has been assessed as fine but you've been given no real answers (I in fact brought this condition to the attention of my doctor as opposed to the other way around).

http://www.samaritans.org/

I've found calling this organisation to be a mixed bag. Sometimes the person on the other end of the line is really supportive, suggests ways to calm down and listens to your problems. However, I have also had the experience of patronising people who belittle the problem (and the person, by proxy) and are not at all sympathetic or useful. I suppose it depends who picks up- but when they're good, they're very good, and when they're bad, they really are terrible. Definitely worth contacting if you're panicking (if only because being slightly irritated at their tone might distract you)! Also, 24/7!

 http://www.rethink.org/

Good amount of information on this website! The calls again can be either very good or very bad, but it's worth a look around if you're feeling a bit isolated. Helps to make you feel like you're not alone and that there are ways you can be helped. Again, 24/7!

http://www.anxietyuk.org.uk/

This is specific to the particular type of panic disorder that I suffer from. The helpline is open in day time hours (boo, I have most of my panic out of hours due to feeling like there is no one who could help me!) but it's a fantastic site with lots of information and good ways to help yourself. Also, everyone on the other side of the phone is not just trained in mental health matters, but has suffered with anxiety. It is incredibly reassuring to hear somebody who has overcome it help you calm down! Definitely worth a call regardless of whether you're currently having a panic attack or not. 

These are the specific helplines that have helped me so far when I've been feeling really stressed or upset at night time and am having a panic attack. There can be a very real feeling of thinking there's no one who can help you (as a lot of places are not 24/7, like GPs and various helplines) but there are still people if things get tough!

Remember: If you think you are in imminent danger of harming yourself or others, or your symptoms change, call 111 or 999. There are also crisis teams at A+E departments who can help (and 111 would be a good way to find where your nearest one is). But generally speaking: TRY NOT TO PANIC :