This is an HIV forum, and no one here can diagnose the cause of your red bump. As suggested, you may wish to seek out a therapist to assist with your irrational fears.
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Channelize your emotion correctly. There seems to be no reason for your to speculate some one injecting you to give you HIV.
This is purely obsessive behaviour about an irrational fear. What is your guilt that is causing this?
Find the root cause and rectify it, HIV is not your problem here, maybe guilt of cheating, maybe OCD, maybe paranoia could be any thing but not HIV.
Only you yourself can tell you the truth, the sooner you speak to your self, the faster you will over come your irrational fear.
No testing warranted whatsoever. If you test, you will start another obsession of testing incessantly. It is better you find the root cause of your irrational fear. Untangle the knot of your mind, do not tie another one. If you need help, seek help. I reiterate HIV is not your problem.
Your symptoms are very vague and definitely not due to hiv. Probably due to anxiety.
As much as i am annoyed by your fear, i suggest u talk to someone.
Honestly, this is a no risk event. But if taking a test calms u down, go ahead
1) u will no if u have been injected
2) no, it just shows some blood clot on the epithelial surface. Could be a scratch. Sometimes this stuff appear on my body
3) why are u even thinking of injection for no apparent reason?
This is an irrational fear with no basis in reality. People don't go around with syringes full of tainted blood sticking people with it. It literally doesn't happen. It's an urban legend. You had no risk because you used condoms and she did not inject you with anything. If you continue having these fears, you need to find a counselor with whom to address this because it's not at all normal to be worried about such irrational things.