I am so sorry you are dealing with pain and issues again. Sadly, a hysterectomy, with or without an oophorectomy, is not a cure for endometriosis. So yes, your surgeon may have missed some implants during your surgery.
Are you definitely scheduling surgery or just discussing it? Does your GYN think the issue is endometriosis or something else? If you are needing surgery and you do feel it is endometriosis, you want to be sure you have a surgeon who has the skills to locate, recognize, and excise the implants. I definitely concur that you should consider a second opinion before heading into OR and finding an endometriosis specialist would be ideal.
I would suggest you keep a detailed symptom diary
that you can share with your doctor. This can help both of you figure out what is going on, especially since endometriosis and adhesions don't tend to show up on diagnostic tests. It can also help the surgeon to know specifically which areas to check during surgery.
Has your doctor stated what might be causing the bleeding? If it is vaginal bleeding, endometriosis can exist in the vagina and in the vaginal cuff. Bleeding can also occur with bladder issues and many of us with endometriosis also have a co-existing diagnosis of Interstitial Cystitis. There are other reasons for bleeding including infection and vaginal dryness.
I don't mean to be the bearer of bad news, but if your surgeon does find endometriosis and if s/he is able to meticulously excise it, your recovery could be worse than your hysterectomy. Thankfully, my specialist's office had warned me about this so I was prepared for the painful recovery that followed my excision surgery. In fact, it was the most painful of all of my surgeries. Others have found this to be true as well.
I wish you well and hope you know that we are here for you! Please feel free to post any questions or concerns you may have and we will try to answer based on our experiences and research.