Kefir and Crohns

Please advise: I have had great success initially with milk kefir grains. the temp in the roo has reduced due to winter starting here in the UK. Now my grains will produce thick kefir but also have 20 percent watery consistency that i tip away. The fizz that I was getting from the summer months has gone. My grains have become quite large and dispose of approximately half a table spoon from the grains and maintain possibly two table spoons of grains to approx 3/4 a pint of milk.
Are some of the grains perhaps inactive. I was using them to help with Crohns disease and they were fantastic initialy and have helped me off of steroids. I have now had a flare up and the Kefir does not seems to help. Tweet