Ah a new piece to your puzzle -
Ritalin has received a black box warning from the FDA concerning its links to sudden death, heart attack, stroke, increased blood pressure, increased heart rate, worsening psychiatric problems and new manic symptoms.
Ritalin (methylphenidate) is an amphetamine-like prescription stimulant commonly used to treat Attention Deficit Hyperactivity Disorder (ADHD) in children and adults.
Also, in addition to increasing heart rate and blood pressure, causing insomnia and weight loss, and sometimes causing psychotic symptoms, the stimulant medications used for ADHD (methylphenidate and amphetamines) may cause heart disease if taken for a long time.
I would suggest you discuss your use of Ritalin with your Dr.