thanks for writing to HCM,
In the above provided description i would tell you to start noticing some skin colour changes in your leg when you feel numbness
for that pulsating pain. if skin colour is also changing (to pale, bluish, reddish pink from your normal skin colour ) kindly see physician nearby you because then you will be needing some tests regarding your problem.
And if there is no skin colour change, then this problem can be related to musculoskeletal structures like your stretched nerves or muscles, which can ruled out by doing clinical examination including some neural and muscular stretch tests, which can be performed by a physical therapist.
and if it due to this above mentioned cause, a physical therapist can help you.
hope this answers your query
wish you good health