Blood Clot Due To Midline

I was in the hospital for two weeks. Last week they found a blood clot due to the midline they put in my left arm They took the midline out told me to give myself two shots a day & a 7.5mg warfarin tablet @ night & sent me home. I have been on this regime for 1 week. I have no insurance & to get a pcp they want $100.00 per visit plus whatever the medication costs. I only have $200.00 for the rest of the month. Can I just stop taking this medication? They were not going to put me on this medication but @ the last minute decided to. Please let me know. Thank you.