I also use Prolines test prop, 400mg/ml, it was very very painful the first 2 weeks but your body gets used to it. I also cut the oil , 1part prop, 3 parts sterile oil, also warm it under hot water and take ibruprofen, this really helps. The pain and swelling your experiencing is normal. I like the products and the service is solid, my cycle is going well and I'm getting the results I'm looking for. My 2 cents.