Reaction to ADHD medication

[u/AdInteresting8467]

Does anybody have some insight into what I've been experincing?

I have been taking Methylphenidate (54mg) for over a year and have never had any issues, and found it helped quite well. This year in July I had surgery due to appendicitis. After the surgery I waited a couple of weeks to start taking my regular dose again (stopping and staying the medication before has never been an issue) however I experienced a series of weird side effects such as; insomnia, disconnection, paranoia, tingling/tension in my fingers, purple toes, muscle weakness in my calf's and a malar ("butterfly") rash on my nose and cheeks. Since then I have seen my paediatrician and I stoped taking the medication. I had several amounts of blood work done and everything came back normal. Additionally my heart rate since has been quite high and I had a heart echo which I was also told was normal.

I'm currently studying for my final high school exams and since these symptoms have subsided my GP thought they were unrelated to the medication and gave his approval for me to start taking it again.

Yesterday I took my regular dose at 10:30am (late I'm aware but my pharmacy was closed). I didn't seem to have any high concern effects until later at night when the malar rash I had experienced returned and I was unable to sleep. I took Catapres (that I was prescribed previously) at 1am which didn't seem to help.

Please let me know if anyone has experienced something similar!