Hi Apha - the soft stool is a good sign. That means that constipation is unlikely because the stool hasn't sat in your colon long enough to dry out. The Miralax helps with that too, because it draws water from your intestines and colon to keep stools soft. I think you might also want to reduce or eliminate the Metamucil - that doesn't help everyone and can constipate some people (or at least slow things down), especially if you can't drink enough water to make it work properly (that was my experience). I recommend increasing your intake of insoluable fiber: fruit (except bananas - they can constipate ... and so can apple sauce) and veggies, like green beans, broccoli (but not too much because that can cause gas) and especially leafy greens like spinach (that will make me go every time!). Raw veggies are especially good. Avoid too many root veggies (potatoes, yams) because they are mostly soluable fiber - they are good, but they bulk the stool and that might slow things down a bit too much for you right now.
The real trick is water, water, water! Drink LOTS of fluid (not alcohol, coffee, tea or anything with caffineine) - juice and/or water.
Also, try some relaxation techniques - I've learned not to underestimate how much my anxiety affects my bowels. Really, I'm very serious. Relaxing is incredibly important for having good BMs. I learned that the hard way!
I hope these things work. If they don't you should contact your surgeon about getting some stool softeners they recommend. I hope you find relief soon!