Hi. I have been taking the above medication since May 15, 2012, I went to take my daily pill today and it dissolved before I could even make an effort to swallow, this has never happened before. I took a few of the pills and put them on a plate and poured water on them to see what would happen; they vanished in a second. I try to store the pills as best I can from heat, usually in a room with air conditioning but it isn't always on when I'm out and it is so hot.
I would like to know if I am still getting the dose of medication even though the pill dissolved on my tongue.

In a word - yes. Obviously make an extra effort to wash it down.

Sometimes the danger with a pill that disintegrates is that it should be slow release and now it is not.

That's not the case here.