I'm a 64 year old male. Since about 5-6 days back I've been experiencing pain in my lower abdominal / groin area. I have looked at diagrams of the human body, and the painful area is around where the lymph nodes are located. The pain started on the right side (just a tiny bit on the right from the center). I felt around and it appears to be a lump/bump there, it's not really hard but I can feel it when I touch the area gently. If I push on it, it kinda "melts in" and I don't feel it as clearly. It feels about the size of a ping pong ball, but it's hard to tell the size for sure as I'm scared to touch it. Today I started having pains on the right side too (but not as severe as on the left side), and I felt the right side and there appears to be a bump there as well.
The pain comes and goes, it's not constant. It seems to start whenever I do anything physical such as exercising, any longer walking (as if I go out on a walk).
Right before or around when the pain started I felt like I was developing a cold (runny nose and itchy eyes), but it never broke out and in retrospect I think they were allergy symptoms.
I don't know if this has anything to do with the pain / swolleness, but I'm doing moderately light exercise at a gym 4-5 times a week and just before the pain started, I tried the "planking" exercise for the first time for about 90 seconds. About a day or so later or so this pain started.
I have scheduled an appointment with a doctor but they had no opening until over two weeks from now and this worrying is killing me. Of course I suspect cancer. Because if this was a hernia, it wouldn't be on both sides of the groin area. So I am thinking the lymph nodes are infected / inflammated. What do you think it could be? What should I do / not do while I wait on the doctor appointment?