First off, don't worry about giving off too many "tells" at the microstakes. The common microstakes player doesn't pick up on many tells, and they routinely fail at exploiting whatever information they might pick up. So you don't need to worry about balancing your range, or anything like that at the micros. You just need to worry about making the most +ev play with your given hand, and the given opponent.

Second, the longer you are around poker, the better you will start to understand variance and how it works. You sound as if you expect you will always win when you play well. But that isn't the case. You can sit there and play perfect, and still have a losing session.

Things you should consider that will determine whether you should continue playing or end the session, or move tables, would be things like (1) Are you playing your A-game? (2) Do you still have an edge at the table? (3) Do you want to keep playing?

If you aren't tilting, and you still have an edge at the table (it's still a profitable table), then you can continue playing. You might continue to lose, but that would just be variance at work. If you can't handle those loses, you are probably underrolled, or need to work on your emotions relating to poker.