I think that the old statement that you can't do both is a myth. Many times I have trained and gotten stronger (ie built muscle) while losing weight. A couple of other things you said though can be interfering with gaining muscle.

If you are using weight machines every day, for the same muscle groups you are overtraining badly. The workout tears the muscles down (gives your body the signal that more muscle is need to accomplish tasks) while the recovery period (time between workouts) is when new muscle is developed. You are not giving your body time to recover if you are working a muscle group more than twice a week.

All the aerobic and swimming work also sends your body mixed signals, which is to get lean (ie shed muscle mass). Most competitive bodybuilders do very little cardio until right before a contest.

Just food (low carb of course ) for thought