Well, it could have been the standing, it could have been the moving, but the fact is, Constipation and straining do cause hemorroids too.
So maybe it was one or the other and maybe it was all three factors that compounded to cause stress and strain, or maybe it was something totally different that you have not considered.
Anyway, the Gastroenterologist might be able to help you with a medicated suppository. They also recommend those OTC medicated wipes for people with hemorroids.
You could try a sitz bath which has been used for ages to relieve hemorroidal pain.
And If possible get some walking in. Even if you hurt you need to keep moving to keep your colon working.
Not standing, not lifting, but easy relaxed walking even if it's just around the house for a few minutes each day.
Increase your fiber and water and eat foods that contribute to your bowel movements.
Even if you are not thinking of surgery it might be a good idea to see the Doctor. The Doctor may see something that would give you a much more clear remedy for your problem.
I also like to get foot massages when my colon is giving me trouble. Reflexology too.
I don't get hemorroids but I get colon spasms and that's right up there with the painful rectal issues.