How long does it take you to get cramps, bloating etc. after eating?

Hello, for almost half a year I've been having stomach issues. My doctor said I should try a lactose free diet. For the past two or three weeks I only ate no lactose or low lactose foods.

I was feeling fine and my dumbass thought I should do a little experiment. On Saturday I ate yoghurt, didn't feel anything, on Sunday ate cereal with milk, didn't feel anything. Monday comes around and in the middle of the day nausea and bloating comes. Now it's Tuesday, still feeling nauseous.

Most people say it takes a few minutes or hours for symptoms to arrive but not days and it also doesn't stick around for that long. Of course I know everybody's different, I just want to know if it's normal for lactose intolerant people. Maybe I'm not lactose intolerant and it's a different problem, maybe it's because it's just starting. ¯⁠\⁠_⁠(⁠ツ⁠)⁠_⁠/⁠¯