I second looking into bike set up. As you are getting stronger it's hurting more = position issue. Some causes you might look at- Saddle too low, possibly coupled with saddle too far forward. Fore/Aft cleat placement can also play a role. There's good bike pain and bad bike pain. This sounds like the latter.Take care of it and get to the good stuff.
Best regards, Eruc

PS I'm just an old bike rider,not a medical professional.