Thank you Mary G and Hurdity for your advice and thank you Lizab for the hug.
I have seen GP and he was very concerned that I was feeling so distressed with lots of different symptoms. He is wondering if it's a combination of menopause and depression/anxiety, he has given me a couple of questionaires to complete, a weeks worth of sleeping tablets so I can get some rest, blood tests in the morning to check hormone levels, thyroid, blood count, sugars and a few other things, he has signed me off work for a couple of weeks and I have to go back and see him next week, where we will come up with a plan of action together. I am feeling much less hopeless this evening and relieved that my GP is being thorough with his investigations instead of dismissing me as a hysterical mess. Thank you to everyone who has replied, it's very comforting to know I'm not in this alone xxx