Recessed lighting issue?

Yesterday afternoon I was in my kitchen. I have a dimmer switch that goes up and down. I have five recessed lights. I turned them on. Three minutes later they all went out so i thought the power went out. But I looked at the microwave and stove and the clocks were on. The tv was on in the family room and my son was on the computer upstairs so there was no powere issue. I walked over to the dimmer switch and turned it on and the lights came back on. I was freaked out because I cannot remember if the switch was in the off or on position when I flipped them back on. When the dimmer switch is in the halfway position it does buzz, and I did notice that one bulb seems to be burning out. It just scared me because I thought my God did I have a stroke or seizure or something like that. Is this most likely some electrical probloem. I hope this can be solved to put my worries to rest.