Nagging pain from left testicle upward

[knvn]

For a week now, I am feeling a nagging pain from my left testicle, going up and ending just above on the left side of left hip.  I have to be extremely careful while sitting down on a chair, getting up, etc. as I feel a stretching pain (nerves?).  The pain is not severe or unmanagable yet, and hence want to know if this will go away normally or I need a consultation and if so, which speciality?

I am male, 57, keeping good health (except teath problems - most of them, whatever left, are really bad).

Please give me guidance.

Thanks & best regards
knvn