I'm not sure if I'm imagining things.

I take estrogen patches and when I put on a new patch I feel like there is mucus in my nose and throat.  Does estrogen change mucus?  It doesn't last long or bother me that much but it seems odd.

Everything tastes sweet, when I lick my lips or swallow spit it's like there is sugar in it.  Water tastes a lot better.  I know smell and taste can change but does anyone experience with their saliva tasting sweet?

Yes it dose it's a known phenominon particularly with pregnant women it has to do with the increase of estrogen.

http://www.babycenter.com/0_stuffy-nose-during-pregnancy_1076.bc

I noticed it too shortly after taking my injection I would often have a sneezing fit and have to blow my nose.
My sense of taste changed but in my case it was more an increase in the sense of sour and less sensitive to sweet things.