FTM... Not enjoying this stage

Bailey
So this is my first pregnancy i am almost 23 weeks with a healthy baby boy. But this pregnancy makes me anxious and stressed, mainly because the unknown of what all these feelings are! I get anxious about pre term labor any time I have Braxton hicks or vaginal pain. And logically I should know I'm fine. I have heartburn which causes my bowels to be all funky and I'm not sleeping well so I have no energy! I have an appointment on the 5th and I know I just need to try and relax my mind, but i don't know how... It wasn't like this before being pregnant so I'm not sure how to handle it!