This year ater going to swim in the sea I get Raynaud's in my hand and feet too. It seems to be quite common side effect. I have a few questions:
Does it go away, like if I stop the medication?
Should I see my GP? I have a follow up medical review in a few weeks though.
Should I be concerned?

I started my medication just about 4 months ago after being diagnosed this year at age 49. I take 50mg of Ritalin LA, I take 30mg in the morning and 20mg later around 2pm to make it last longer. Originally I guess I was supposed to take the whole 50mg in one go in the morning but I got bit tired afternoon and thought 50mg is a bit much in the morning.

I used to swim in the sea all the time and never got these before, although when the water was very cold some of my finger and toe bones hurt abit.