I've Had Mine for 3.5 Years And....

When I first got it on my 30th birthday I had bad cramps for a long time. Spotting for months. It was so unpredictable! Ok so flash forward to now I've had it for like 3.5 years...have a light period here and there. Maybe one month maybe not . No more hair loss like at the beginning but man no sex drive at all too. So I'm not crazy! Yeah just have no desire at all. Now just today lil bit nervous because I thought about the last time we did have sex was like 8 weeks ago... Last couple weeks have been eating lots, I have been blameing it on crappy Ohio weather, then was craving beer the other day??? I don't like beer! So I checked for my strings and they are there but just the little poking I did there was some blood (bright) and not like period but like my cervix is super sensitive or something. So wondering if this thing now has failed me. I will freak. I'm 33 and have 3 kids and the youngest is 3.5... Can this fail after 3.5 years? I go for a check up in 2 weeks so maybe I should have it removed because I'm sick of not wanting sex and yes I also yell at the drop of a pin! Ahhhhhhhhh