I am sorry to hear your cat is urinating in inappropriate places. My name is Rebecca. I am a veterinarian and will do my best to help.
If she has never done this before, I would first rule out a physical problem, such as a bladder infection, or bladder stones, by doing a urinalysis. She may just need a course of antibiotics for an infection, or a diet change for bladder stones. She may need to have blood tests and/or an Xray if the urinalysis appears normal.
If there is no sign of any physical problem with her then you have to treat it as a behavior problem, which is not so easy: multiple litter pans, very clean, with unscented clumping litter; adding Cat Attract, an herbal product, to the litter; no hoods or covers on the litter boxes; keeping your bedroom door closed so the bed is off limits; Feliway diffusers (emit calming phermomones); prescription anti anxiety medications.
This is probably not a behavior problem, however, since it just suddenly started. A urinalysis should be the first step and may be all you need to do to find the problem and treat it.
Let me know if this is helpful and what other questions I can answer.