I use a dose tray thingie I bought at CVS. Seriously, like $5. It has a slot for AM and for PM, Sunday thru Saturday. It helps me to remember to take my meds by setting it on the counter, next to my coffee pot. That way, anytime I'm in the kitchen, it's there and I can clearly see if I've taken that dose for the day. I usually set it up every Sunday night.

As for causing problems by not taking your meds. Some meds take a little time before they start working... to get in your system, I guess. By skipping doses, consistently, it would seem you'd be keeping yourself from getting a regular dose, meaning getting treatment from those meds.