I have found that both cramps and joint pain have been relieved quite significantly, if I drink two large glasses of cold water from the tap in the course of the forenoon. In all about ½ pint of water.
This is, of course, in addition to my normal fluid intake.
By drinking it early in the day (unless I am going out in the forenoon, when I wait to early afternoon to drink it) I am not having to get up to wee constantly overnight.
You might like to try this "cure" while waiting for a doctor's appointment, because from your description, your GP, might well be able to help or explain this increase in pain.
I have no experience of a circulation booster but find it hard to see how it would help alleviate the pain you are having.