Should I see a doctor?

[foobar]

Hello,
I shot heroin for the first time a couple of nights ago. While it felt very nice, I have decided not to repeat the experement. Since then I have felt horrible. . .at first I passed it off as withdrawl (from my first hit?), but now I am growing concerned that I may be suffering from some sort of infection. The injection site is clean and shows no sign of infection, as of yet I do not have a fever. . I just feel awfull. I used a new/sterile needle and was carefull to swab the injection site. While my initial reaction is to see a doc, I am worried about repercussions for bringing up a heroin related issue.

Should I see a doctor or am I just a hypocondriac? Any thoughts would be appreciated.