Diagnosed with ibs

Sorry forgot to say please

IBS can be a symptom of a number of conditions. I have ibs but it's a symptom of my Chronic Fatigue Syndrome (used to be called M.E.). I have since also developed fibromyalgia and peripheral neuropathy.  Yes I still have IBS the same as other people but it's just a symptom of something else. Try looking at this information; https://patient.info/health/chronic-fatigue-syndromeme

Your mental fog, fatique etc sounds very similar. If it is you will need to push your dr to send you to a specialist for diagnosis.

The reason it might be the same time of day is the spoon story describes. You have a cup with 6 spoons in it. This represents the amount of energy you have each day to use. For each thing you do in the day you use a spoon (energy) and if you go over the amount you have then you will pay the price with your condition getting worse. The fatigue kicking in, brain fog etc. If you use too much on too many days you will notice you will get worse and will be more likely to catch infections and viruses.  The longer it goes on where you use to much the worse it can get.  I was told by drs for years I was unfit and pushed myself to do more and more until I was nearly bed ridden.  

If you've had it up to 4 years there is still a chance you will recover. If you have had it over that length you are more likely to suffer for it for life. You can go into remission but it can come back at anytime. i've had it for 10 years now. 

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Try anti spasmodics, probiotics, over the counter painkillers or the Fodmap diet.  These things may or not help.  If they do, it is likely they will only reduce pain rather than get rid of it entirely.

I also have terrible problems at the top of my sotmach with pain discomfort and this is where I think my palps start from 

Look into teas, ginger tea, peppermint tea. Try chewing on fennel seeds after a meal.

stimulants like caffeine and alcohol or dairy make it worse. 

Maybe magnesium to settle things down 

For the pain and as a anitispasmodic buscopan is good personally i use cataflam it's great and it's wonder in pain relief and also probiotics they are really important the refrigerated ones that come in ampules are the best, also regarding your heart palpitation maybe cos your bowel or stomache is distended and pushing against your heart in that case you should get rid of the gases trapped within, buttermilk works for me it has natural probiotics and reduces gases pretty well.... you'll have to manage for the mean time you wont be able to know whats best for you until you try here n there until you establish a base