Greetings: we are nearly the same age and became progressive at about the same time. I developed the disease a bit before you, though, but it was so minor back then, I didn't really think about it.
Unless you disease was as active and aggressive as mine when I started the antibiotic regime, you wouldn't necessarily expect to see any big improvements in only three months, but it is good that you have had no negative side effects until starting the flagyl. It certainly does make you feel amazingly tired, doesn't it? As for the stomach problems, are you taking plenty of either live yoghurt or acidophilus capsules? They are essential.
You might care to write to my husband, Dr. David Wheldon, with any questions you might have. His address is at the bottom of this page:
Your GP likewise would be welcome to contact him.
One more thing: don't feel that you have to take the flagyl for the full five days first time round. I must admit that I very rarely did. What a coward! I still got better, though.