I wouldn't worry about it if I were you. The radiation in a microwave is completely harmless, except that it causes heat (it is no more harmful than hot air). So there is no reason to worry about your food.
If you think some of the microwaves are leaking out, that is also not much of a worry. Try putting your hand next to the microwave. If you feel your hand getting warm, perhaps some of the radiation is leaking out. If so, it's not dangerous. It is, again, no more dangerous than hot air. As long as you don't keep your hand (or other body part) in the radiation for long enough to heat up and cook, there will be no concern. Actually, the use of microwaves was considered for heating homes at some point a few decades ago, as it would deposit the heat directly into the things that wanted the heat -- the person. But this idea was eventually dropped, not because of potential hazard to the human occupants, but because of technical difficulties. But the microwaves that are used in microwave ovens will only cause harm if you expose yourself for long enough to heat up and cook. This, by the way, is exactly the same risk you run with a regular oven, though the regular oven can get hot to the touch, so is more dangerous.
The real risk to using your repaired microwave has to do with electricity and fire risk. If you fixed it improperly and caused a short circuit or left a hole in the panel, it could overheat or spark, and could possibly cause your circuit breakers to trip, or in bad cases, cause a fire that would burn your house down. If you are worried about anything, that is the thing to worry about.