Hi dear you have been having digestive issue since seven years,and doctor didn't found any thing wrong ,has he performed your EGD,commonly called as endoscopy
,to rule out any thing wrong in your stomach and intestine.as for as your oral sex
is concerned,it will not disturb your digestion,even if you have swolled the semen,they will be destroyed by strong acidic Ph of stomach , As for as the issue of the lidocaine
is concerned it is a local anesthetic
,has many uses and commonly used for doing small surgical procedure.however its 10% spray is also used to prolong the sexual act, small concentration of which if swallowed during oral sex will not upset your digestion, as 2% lidocaine gelly is given to swallow for carring out procedure called as EGD,That is Endoscopy.