I am a nervous wreck your answer is very appreciated...?

Hi I am a 23 year old female. I am a worrier and I think I might have an issue with anxiety and panic. I was feeling fine about a week ago when a co worker was talking to me about a guy he knows who has a blood clot in his head and that he could die any day. After my co worker told me this while I was at work I had a full blown panic attack thinking that I might have a blood clot in my brain. So I went home early and went to urgent care. I broke down in tears in front of the doctor and he calmed me down ran some basic balance and coordination tests and said he didnt think there was any need to do any further tests. He explained to me how blood clots and anneurysms work and that if I had one I would probably being showing signs of it. So its been about a week and he prescibed me Xanax for anxiety. I am still having this funny head ache type of feeling only on my left side and it comes and goes. I went to the dentist today and he says my bite is off and can be cuasing the head aches but he wasnt very reasuring. Then Im wondering could I just be making up my pain becuase I have anxiety? I realy am having some head ache pain I just am scared. I still think the first doctor could be wrong. I feel so embarrased for being this scared. Has any one else ever experienced a head ache on one side of the head and what cuased it and do I sound like I am crazy? lol please help~!