help!

ive been doing makeup for years, its the one thing i really take pride in. i have a routine and certain products that i use religiously and it always looked super good on my skin but all of a sudden my face looks like crap! ive tried different moisturizer and primer and tried switching my foundations and powders and today tried again with different brushes and sponges and it just looks spotty and almost like broken up on my whole face. any ideas on why this is happening all of a sudden or how i can fix it?