Question for MiraLAX Users

I have 2 capfuls a day, one in the morning and on at night.  It is prescribed to me and I've been using it for about 4 years.  I also take stool softeners.  

I've found that it didn't help me much to use occasionally, I need to be on a daily regiment.  

My constipation was so bad I gave myself a hernia from straining.  When I have tried to cut back or stop taking it my constipation became much worse in a matter of days.

I use Miralax every day. per doc orders. I buy the generic Costco brand. I use enough to have a soft movement every morning.   I use more on days that I have more problem "going" and less  when my guts moving too much.. 

Too much fiber constipate me and hurts my guts.  I can't add fiber.  

Because of Miralax - I now have 90% time pain free guts.. 

1000 mg magnesium daily

I take 1200 my daily.  400 during the day, 800 before bed. On top of Miralax. I developed IBS-C. Magnesium by itself does not work for me anymore. Unfortunately.