Hep B transmission Risk

I have concerns on an possible exposure to Hepatitis B.

I recently returned from Thailand where I had an encounter with a sex worker. She performed oral on me with a condom once and I ejaculated. We then mutually masturbated each other about four times (no protection, I ejaculated each time) and dry humped once (no protection, I ejaculated), we did not have penetrative intercourse. My concern is that vaginal fluids transferred from her hands and mine to my penis during the masturbation/ejaculation. There was also some deep kissing.

Is there a risk of contracting hepatitis B?

I have not had a vacination for hepatitis, at 7 days since the encounter i have developed itching all over my body.

Is it worth having a post exposure globulin injection?

Please can you help, thanks.