Welcome to the forum.
I am so sorry that your proctitis has spread into UC.
WHat had put you in remission from the procticis?
And have you been on meds (if so which ones) all this time?
IMO, if you are proactive and control various factors, you could get this under control. It's not a given that UC progresses further.
Are you on any probiotics?
What are your vit. d3 levels like?
Rx meds didn't help me. But 4.5 mg LDN +Paleo diet +supplements=REMISSION.Protein shakes w/almond milk,Maca powder,L-Glutamine,D-Ribose,chia seeds.VSL#3,K2,VIt. D3,slippery elm bark powder.For more info,my protocol is the 11th post at this link: https://www.healingwell.com/community/default.aspx?f=38&m=1666318
If you have any questions, you can find my email address at my profile.