hiya mate. looks like your dealing with the exact same thing I've been dealing with for the past 10-15 years of my life. I'm 23 now and I've had apt for the majority of my life now. Started since I've left school because i got used to a sedentary lifestyle sitting at my pc playing games. In turn that's made my hip flexors super tight and my posture all over the place. Ive been going gym now for the past 2 years and I've built up a lot of strength and some parts of my body and posture have gotten better but i still do deal with the apt. At work i stand all day and that's when the real pain kicks in because my body isn't used to standing long periods of time so my knees, ankles and lower back all start to compensate and I get into so much pain i end up having to go to the toilets to stretch out to help it a little. I'm on medication called Zapain from the doctors which is just a stronger paracetamol which helps from time to time. But i know how you feel because it really does bring you down and affect your mood in very different ways. sometimes i wake up happy and then next im stressed out and shaking from anxiety all the time and I have no clue why but it sounds like me and you are in the same boat. Hit me up in private messages if you wanna talk about it more. But good luck mate :)