Dosulepin 225mg

Its been a long journey this year with food poisoning triggering IBS and then a relapse of Anxiety/depression started new med Dosulepin to help the IBS and anxiety. my doctor increased my dosulepin to 225mg 2 weeks ago, felt great for 2 weeks now in another dip of anxiety, low mood and ruminating, will I ever be me again. total time on Dosulepin 19 weeks, Its so hard to be patient when I felt so good now low again.
Would love some support from anyone on Dosulepin and doing well and is stable. How long for med increase to help just so desperate for consistency.