What are these symptoms a cause of? Fatigue, trouble sleeping, being cold, slow digestion, headaches, bronchial/sinus infections, long term depression/anxiety, fuzzy thinking, short term memory loss, weight gain, muscle/joint pain

There . There is no short answer here. These problems are all likely not related and represent separate issues. The best advice i can give you is to visit your primary care provider for a complete history and physical. Some examples of problems you may be dealing with are: diabetes, anemia, thyroid disorder, depression, anxiety, allergies, arthritis, etc. The list could go on. All these things and more can be ruled out or in after careful evaluation. Best of luck.