I have hemorrhoids. i think its from sitting driving for long periods? can that be the cause? and what can i do?

Can be a factor but:: Many factors including prolonged sitting can cause hemorrhoids. Lack of fiber and bioflavonoids contribute. Try to take a break every 1-2 hours to walk for a few minutes. Eat more fruits/veggies, consider fiber supplement, I like a supplement called Vein Factors. A rectal heating device called Delwa Star helps a lot. For home remedies see https://earthclinic.com/ailments/hemorrhoids/

Yes Multiple options: Prolonged sitting is a commonly considered risk factor. You can relieve irritation by sitz bath or nonprescription cream/ointment (caution: most anti-itch cream/ointments are for short term use only – longer use suggests need for a doctor appointment). Increase fluid & fiber intake and avoid straining & reduce time on toilet. For other prescriptions or minor procedures, consult your doctor.