You could certainly consult your doctor about the areas of discomfort you are having (thighs, scrotum, underarms), but the swollen lymph node in your neck is not a cause for great concern. It arose at a time when you had a fever and sore throat, which is its job.
After an infection has resolved, it often takes a long time for lymph nodes to go down, and sometimes they never regain their previous size.
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Discomfort in armpits and in groin and scrotum is most likely to be due to sweat dermatitis. This could also be the reason that despite the healing of sore throat, the lymph node swelling is persisting. Wear loose cotton clothes and avoid tight fitting clothes. You can also use an astringent lotion. Take regular baths and keep the area dry. You can also take an antiallergic for a day or two and see. If still the symptoms persist consult a doctor.
Hope this helps. Please let me know if there is any thing else and do keep me posted. Take care!
How about std's? i worry about lymphoma a lot too. Can't they biopsy your nodes?epstein barr virus? Hope you get better soon and let me know what you find out.