Headaches, Swelling In Muscles Of Back And Neck. Had An Automobile Accident. Taken Aspirin. Why Has It Affected Erections?

I had an accident 2months ago which caused a whiplash.I did scan which showed that muscle is swollen at the back of my neck and I had been havin severe headaches but was given ipbrufen n later aspirin for month to reduce the swelling.however the last scan I did showed litle improvement but the headaches r less frequent.my big problem is that I can't ve morning erections or durin the night but I get aroused when my girlfrend touches although it takes longer for me to hav a hardon but when I do its strong n I maintain it until I ejaculate then I ve a headache.wat can I do?