Welcome to the HIV forum. I'll try to help.
You are overreacting to a non-risk situation. You had protected vaginal sex; pulling the penis out of the condom, while the condoms remains in the vagina, does not mean the sex was unprotected. And probably your partner doesn't have HIV anyway. Finally and most important, your negative HIV test result at 5 weeks (36 days) is almost 100% proof you did not catch HIV. To be even more certain, you could have another test any time after 6-8 weeks. You can expect a negative result.
As for your symptoms, they don't sound like those of acute HIV infection. And whenever a person suspects his own symptoms are due to anxiety, usually he is correct. So anxiety seems like a good possibility.
Have another HIV test if you remain worried. But in the meantime, settle down. Almost certainly you did not catch HIV.
Best wishes-- HHH, MD