Very oily hair

I have extremely oily hair. Thought it was my shampoo and conditioner so I changed. It’s now maybe 3 or 4 washes later and no change! I shampooed 3 times in a row last wash!! My hair is still oily?! Is it me? I can feel the oil isn’t leaving my hair when I’m shampooing it. I can still feel that it’s oily when I get out especially at the back when I flip my hair over. I have my partners fathers wedding in two weeks and I’m freaking out. 😭 It’s been like this for months I think. I can’t remember when it started. Seeing a hair dresser tomorrow, hopefully they can help. 😣