Hi U:) Well, congrats on the quiting smoking...better now, when you are young:) Being young (and not a smoker for all that long), your body is going to recover from the smoking issues quite rapidly. Feel great about that! Though, I do know you're still struggling through all the physical symptoms of quitting (this shall pass:) and this has caused an uptick in your HA. At 23, RARELY are there concerns for a sinister disease to be lurking...other than those faulty logic concerns that HA can throw at us. You said you've been able to keep your HA in check, for the most part, recently...so there is no reason to believe you can't find yourself some solace, once again. The ability to garner relief doesn't, simply, disappear. It can get shielded, though, by an onslaught of negative thought processes created by a trigger, in cases. Your trigger would be stopping smoking and the associated physical (and mental) effects from that.
You said, "I just hope all this back tenseness, ribcage pain, breathing issue nonsense is all related to my body not knowing what to do with all my stress without smoking."
With the OK, as far as health concerns, you got from the Doc, I would have to agree with your assessment. Man, stress can cause some pretty heavy duty aches and pains in our muscles, as we are tensed up, often without even being aware of it. We, also, can't discount how important our posture is, how improving our overall muscle tone will benefit our well-being, how improving our body alignment and promoting good joint care will make us, simply, feel better. Exercise is critical, IMHO, for peeps with HA to, fully, become mindful that we probably don't have a serious health issue, if we can tax our bodies through some strenuous exercise and cardio. To me, alleviating HA symptoms and thought patterns, is really aided by being as healthy as we possibly can be. There are MANY things in this world we cannot control. But, we CAN control what we put into our bods and we CAN incorporate healthy living habits and activities into our life:)
Again, congrats on the quiting smoking. You'll be glad you did (especially having HA:)
Peace and Feel Well:)