You'd have to be crazy not to. Pred can be very effective in knocking this out before it gets worse. I realise it may not always work but has been very effective for me over the years. I have never been on it long term. Arrest the inflamation asap.
See my post on hospital stay which I just post regarding IV steroids and you'll see what they do when its severe.
The long term effect if steroids and the short term effectiveness where they work for you should not be confused.
Dx Proctitis - 1989
Dx - UC 1992 - Left Side Moderate
Dx - UC 1996 - Pan Colitis - Severe
Remission until 2005 (couple of mini flares inbetween)
DX - UC 2005 - Pan Colitis - Moderate Severe
DX - UC 2008 - 43 CM Moderate...
All of the above required a hospital stay and 5-7 days 4 X 100mg Steroids, Asacol and Prefoam Enema's (20mg).
I take predfoam for mini flares and rarely have had to take pred tablets inbetween remission
On Asacol 2 x 3 times per day since 2005