I have pain and pressure in upper left leg

I am a 30 yr old nonsmoking female who is a couple of pounds underweight but not malnourished. I don’t take any prescriptions or drugs and only drink about once a month. About two years ago, I had what doctors thought was a staph infection due to an ingrown hair in my groin area (it was never tested for staph, but he told me I had one and gave me antibiotics, which I took as prescribed). Ever since the staph infection, I have been getting pressure and sharp or dull throbbing pain in my upper left leg. The pressure/pain is on the very top and the inside of my leg. Before the last two weeks or so, the pressure and pain would only occur for a couple of minutes in very sporadic intervals. Sometimes I would go several days without any pain or pressure. However, in the last two weeks or so, the pressure and pain has been in my leg more often than not, so I am a bit concerned. When I press on the area, it doesn’t hurt, but is a bit tender. There’s no redness, sores, or puffiness there or anywhere on my body, and it doesn’t appear that I have another ingrown hair. When I walk, the pain lessens or is the same. When I sit, the pain/pressure usually gets a little worse. Also during the last couple of weeks or so, there have been sharp pains in my left armpit. The pain only happens approximately once a day for a few seconds. I can feel small nodules in my groin, neck, and armpit they don’t hurt. I’m not sure how new the nodules are. A few years ago or so, a doctor told me I had permanently swollen lymph nodes, and he thought it was because of a tonsillectomy that I had as a little girl.