Avonex injection problem


i have been taking Avonex for approximately 7 months now and have had a few instances where it really hurts when injected and swells/bruises immediately and bleeds a lot. I am injecting into the thigh muscle as advised by the nurses so not sure how it’s going wrong.

This has resulted in me getting quite a lot of anxiety when I’m due to take my injection as I’m genuinely scared in case it hurts again. Can anyone offer words of advice or has anyone else experienced this?