Is Bloating And Stomach Pain Sign Of Lactose Intolerance?

I have a history of stomach issues. since I was 7 I was diagnosed with lactose intolerance, then at 14 my appendix burst, and when i healed i was not lactose intolerant anymore. Everything went away and then in college, age 20 I started having bouts of lactose intorant stomach aches not all the time but occasional. Along with feeling sick after I ate and bloatedness. Again i got lots of tests done with no conclusion. Again, I am now 27, and it is back. Most recently I have felt bloated for almost 2 weeks. Feel sick when I eat. It is 80% of the time. When is it time to go to a doctor?