Bursitis is supposed to go away. When it comes slowly, because of weight or repetitive 'wrong' movements it will usually take longer than when it is because of physical trauma.
Kid had bursitis in her hip due to a fall. The bursitis started two weeks after that, and was intense from the start. Took her two weeks before it was doable to walk without painkillers. And then she healed really fast.
I had it twenty years ago in my hip. Came slow, went slow. Physiotherapy helped. Being pregnant did not help.
Bursitis in an elbow can look really impressive. Check it out. Just the thing you might like, CBC.