Hi Carina62, I've just joined this site but have had diabetes type 2 nearly 6 years. From the beginning I started on metformin and gliclazide. Had no problems and my blood sugar levels were good. November 2015 I began feeling poorly and gradually more and more ill. It lasted over a week. Vomiting was the main symptom. I also had headaches and very bad stomach ache. A bit drowsy, dizzy. Couldn't keep water down. I actually had a Doctors appointment for something else and I nearly didn't go because I felt dreadful. She did emergency bloods and I had to do a urine sample (but I had to go back down with that) After I'd taken it back down and come home again she phoned me and said she had written a letter and I was to go to A + E immediately. She thought it could be DKA. So feeling absolutely awful I made it to hospital. Sitting waiting people kept going in before me that had come in after me. I nearly walked out and said to the receptionist that I couldn't sit there much longer. Anyway I was finally called in, had allsorts of tests, put on a drip etc and was told I would have to be admitted. I have NEVER felt so ill. The following day I saw a Consultant who told me I had Lactic Acidosis likely from being on Metformin. I myself had missed that on the leaflet and it is very rare. I think 1 in 30,000 people have it. I had to stop the metformin. It did take me a week or two to recover. I saw my diabetic nurse and she told me that in her 16 years of being a diabetic nurse she had never had a case. I was off metformin for a while and my blood sugar levels were all over the place. But my diabetic nurse put me back on metformin, I think summer of last year. I was having symptoms again so I was advised to reduce it, stop it. I was very worried it was lactic acidosis again. But, now everything is going ok. ( she did say the chance of getting it again was very low) Touchwood all is ok. ( sorry for the long post!!)