Not sure that drinking water helps, but it won't hurt. But, I have been where you are and ignored it. First of all, how controlled is your BG? If your A1c is over about 5.4 then you are running above normal BG most of the time. There are all kinds of opinions on this, but the reality is that people with normal BG don't have complicationa. People with above normal BG DO get them. The severity depends on how high for how long.
Your vascular system is one of the most vulnerable since it is in constant contact with the inflamitory high BG. Most likely this is your issue. If indeed this is the case it is very likely that you have problems in areas you are not yet aware of. The smallest capillaries are the first to be affected. Like those in your retinas, kidneys, penis, etc.Once these are damaged it is unlikely they can be restored
Therefore, you really should take this pain as a warning and re evaluate your management to make sure you are doing all you can to hold off further complications. I have hhad 5 surgeries and countless treatments totalling over $100,000 to save my eyesight so far. And that is to say nothing of the other problems I continue to battle. Compared to managing my complications, controlling my BG is by far the easiest part of my D.
So YES, exercise all you can. stay active. Walk a lot. Whatever works, just do it. But remember, exercise is just ONE part of it. If you exercise and take your meds but don't "strive" for normal BG it may take longher,but complicatios are onthe way.