I get cold chills when everyone is not cold. I constantly worry, muscle twitches, sore joints, shortness of breath, and muscle tension. What is wrong?

impossible to say. Can't say in this brief forum but you sound stressed out - does that fit? All of your symptoms could certainly be explained by hyperventilation and tension. Shaking chills are ominous if they're followed by fever. Independently, they're not significant/worrisome. Have you had a full checkup?