As i have ocd, doctor prescribed fevarin 50 mg a day. i feel a bit fatigue, and have that feeling of vomiting whenever i sit in a car. is that because of the medicine?

Can check with Dr.: Nausea is a symptom that all people get at one time or another, so we can't guess that it is due to any one thing... unless stopping that thing stops the nausea, and restarting it restarts the nausea, and stopping it again stops the nausea. With OCD, a patient can magnify nausea in her brain, so if a pill causes nausea, the pill may only be half the cause, and the other half may be self-caused.