Feel like i can't take a deep breath, no other symptoms. usually fine in the morning, gets worse at night, sometimes i feel like i'm trying really hard hard to inhale all the way. no other physical health problems, except anxiety?

Spirometry : Anxiety possible but also multiple physical issues may cause this sensation. Get a spirometer and pulse oximeter available at pharmacy and do some actual measurements as well as possible exercises with spirometer. If you find results backing your senation then need to be checked for allergies, asthma, or other respiratory issues that may need treatment. Avoid smoking and smoke.

Need to examine: It is not feasible to provide a meaningful opinion without taking additional history, physical examination and may be some tests. It would be prudent to see your doctor and discuss if you may be depressed. Counter-intuitive as it may seem, exercise may help. Start with low intensity exercise such as walking and gradually increase the intensity as tolerated. Drink more water. Wish you good health!