Dazy a close friend of mine suffers from Interstical cystitis. It is indeed a very harrowing condition to live with. My friend experiences severe bladder pain and needs to get up to the loo around a dozen times a night. Daytime visits to the loo are a frequent necessity. I've lost count of the number of GP and hospital appointments involved. Also a range of medication which has not helped. However, fairly recently a consultant has prescribed medication which is helping. My friend is like you, she cannot eat certain foods because of the pain, inconvenience and tiredness caused by them.
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