I was hypermobile until about a year ago when after decades of both being ignored, told it was all in my head, I just needed to change my workout, diet whatever (I was an athlete...

), etc..., I began to investigate and understand the patterns in my own health and took charge.
After two years of my own treatment program, I worked with a naturopath to help me through some of what came up during that for a short time until I had a handle on things again- the endocrine system is very complex.
I have had insufficient adrenals all my life, which is why I was hypermobile. When the adrenal glands aren't working properly, the gluey stuff that keeps joints at just the right amount of tension is lacking to whatever degree the adrenals aren't functioning optimally.
I have treated my adrenals and thyroid (4 yrs so far and a few more to go) and while I am pg (!) for the first time in my life, my joints are
not hypermobile. Even as they have relaxin in them for pg, they are tighter and stronger than ever before in my life. With RELAXIN they are TIGHTER!!!
I wish that drs recognised this as a health issue and had more concern about symptoms than labwork, because if they had, I wouldn't have had so much pain growing up. I didn't have 'growing pains', I had a lack of 'glue' in my joints. I used to have to put my leg back into my hip beginning when I was around 4 yrs old. It was very painful. I ended up with surgery that did nothing but leave a scar and eat up six months of my life. Everyone told me it was growing pains and then overuse (at 16 yrs old??? Seriously???). Not true.
There are better explanations for pain than that it comes from growing, imo, even if most people feel more comfortable just going with that.
From my own experience and in watching my dc grow, I cannot accept the idea that growing causes pain in and of itself. Pain is a signal for what is not normal, for something gone wrong. Our bodies are wired to anticipate the movements and stretching and tearing associated with growing, so a pain signal doesn't make sense. If growing were abnormal and our immune system needed an alarm, then pain would make sense, but growing is normal, healthy and built into our DNA and our immune function- not abnormal, not requiring any special alarm such as pain.
My pain was an alarm that I heard but that others ignored and that eventually I took on myself.
This is my own perspective, of course and many in the medical industry prefer to go with 'growing pains' when confronted with this, but I also know a lot of hcps who don't accept it as valid and take it as a cue to investigate and resolve the issue causing the alarm. My experience has been that the latter is the more accurate and beneficial response.
OP, I would find a chiro who does paediatrics even if it was an hour away, personally (but we're used to driving that far for everything). I've never had a chiropractor, massage therapist or naturopath covered by insurance, but the medical industry long ago lost my trust and then when I went back (ugh, the regret), I only gained more confidence that that particular industry has too many conflicts of interest to really help me in my real life.
ETA: On hypermobility, it is true that more muscle may help, but it may be a very delicate balance. For most of my childhood and into adulthood, my muscles were too strong for my unglued joints, so while initially building muscle helped, as my adrenals functioned less, my own muscles would pull my joints apart. Imagine that- making a fist pulled my finger joints apart and flexing my bicep did the same to my elbow and so on.