This isn't a DID type of thing so Im taking a stab at this I may be wrong but it sounds like its probably called having hallucinations. Your therapist definately needs to know about this sudden development. If you are on meds that may be causing this to happen or you body has developed a tollorance and dosage needs upping. If you aren't on meds you may need them for a bit for stabilizing purposes. Either way please talk to your therapy professional so that this can be taken care of right away saving you from having even more distress and possibly more extreme hallucinations if this is what it is.