So I had an appointment with my GP yesterday, he suggested I exercise more, referred me to a therapist and gave me a prescription.

I took the first pill yesterday and after about 4 hours it kicked in and I felt a lot better. Much more normal. It's very early days, but right now I feel glad I went to see him rather than trying hair-brained ideas like buying dodgy meds from abroad. Thanks again to the posters above for their input.