I have read your question,
There is nothing to worry in your case , actually this may be just an psychological issue ,
The lump that appeared earlier was actually a swelling of lymph
node , since you had used pain-killers the lump may have been cured and now there is nothing to worry ,
The testicle lowering you have stated might be just psychological since in any such case there would have been severe pain
and further problems , hence it is normal ,
But If you feel any pain further I recommend you to consult a general physician / surgeon for further guidance .
Wishing you a good health,