I've been having trouble with swollen lymph nodes in my groin since the 4th May this year, I've had multiple blood tests that show levels of infection but I've had swabs done come back clear, I've had 2 ultrasounds external and internal but they come back fine we are now September and ones up again I'm so stressed out over it because it's been every other month so started in May, June I was fine, July back up and the start of August but ended around the 7th August and now been up for 3 days I've had enough now I just want to know what's causing this to happen