Hi..welcome to the forum!
It's probably because you're not eating...even small amounts of a meal often times a day will keep your energy levels up at least.
That and enough fluids through various sources...not only water.
I can really relate to the feelings you describe. I don't do well with not eating for long periods of time. I got that often when I was flaring and lost so much weight. My blood pressure was OK, however....but I also developed anxiety attacks that might have played a role in some of the symptoms I was having. It was all very confusing and disconcerting.
When did you start the Asacol and the Rowasa nightly?
You should still contact your doc as suggested and get your blood levels (iron, sodium, potassium, wbc, rbc...) checked out as well as blood pressure. Don't wait.
The nausea can be helped through various ways as well...some choose to drink certain teas or through capsules such as ginger. I found eating helped my nausea...but I also was prescribed dicyclomine (antispasmodic) that helped too.
Do you have good support through family and friends?
Hang tough....it takes a while to get your flare under control...once that starts to improve, you should be able to eat with less problems.
Keep us posted as to how you're feeling.
*Heather* Status: ...Asacol 3 twice daily; Salofalk enemas every 3rd night
~diagnosed January 1989 UC (proctosigmoiditis)
~UC meds: Asacol (3 @ 2x daily); Salofalk enemas nightly for flares & taper to maintenance
~Bentylol (dicyclomine) 20mg as needed; Ranitidine (reflux); Effexor XR 75mg(depression); Pulmicort/Airomir (asthma)
~vitamins/minerals/supplements; Probiotics....(RenewLife Ultimate Flora Critical Care + Primadophilus Reuteri). @ bedtime
~various digestive enzymes as needed
~URSO for PSC (or PBC) 500mg X 2 daily (LFTs back to NORMAL!!)
My doc's logic.. "TREAT (FROM)BOTH ENDS" worth it !!!