>>302379I don't know about your specific issues, but I have gone through periods where I felt really ill for weeks on end with no answer why, and looking back it was often caused by lack of good self care. Things you take for granted like keeping a regular sleep routine, eating healthy, drinking enough water, we all know this but might not really stick to it. If you're not sleeping well that could be a cause of your nausea. Also for constipation try metamucil.
Do you drink a lot of energy drinks or soda? I used to drink a lot of sugar free drinks and get short of breath, for months I was coughing like crazy, I had no idea it was from the soda until I stopped drinking it.
A lot of your symptoms align with chronic stress symptoms too, so if you are stressed a lot your body will react accordingly.