How can I lower my heart rate?

How do I lower my heart rate?

• I'm 5'1.5", weight fluctuates between 95-100 I guess right now. I'm 24, female. Exercise pretty much every day, walking for two hours or so. I have trouble eating "enough" at the moment, because of illness, but it's plenty enough for me to feel satisfied. I have severe IBS-D, Fibromyalgia, Interstitial Cystitis, and either Chronic Fatigue Syndrome or Sleep Apnea, I'm having a sleep study soon. With IBS and IC, it's hard for me to stay hydrated so they thought that could be cause. Or something in exercise, though I do walk for awhile most days (when I'm not very sick). At the doctor the past few weeks, my resting heart rate was finally down under 100. So we thought it was getting better! But this past weekend had a fever for two days, and couldn't do anything but curl up in bed. Couldn't exercise, but also couldn't eat or drink much at all either. This week, heart rate was high yet again. Diet wise, the only caffeine I have is the occasional green tea, and Excedrin sometimes. I don't smoke or drink, I only eat what I consider to be healthy foods...fruits/vegetables/nuts based diet. Don't add salt to anything either. But I need my heart rate to come back down again, and I have no idea if it's a matter of exercise (and that 2 days without it threw things off)-easy to fix, dehydration (harder to fix), eating too little (harder to fix), problem in WHAT I eat? (could be fixed, if I know what it is), a medicine I'm on (though many have been cut out by my doctor already), stress of illness (illnesses are hard to treat, but maybe stress relief can help?), illnesses themselves, slightly underweight, combination of these? I need my heart rate lower again! Resting it can go up to like 120s-140s. My blood pressure is normally just fine though. Not sure how to fix this issue. Any thoughts?

• Answer:

  something called the valsava manoeuvre. hold you nose and close your mouth and blow as if you were trying to blow your nose really hard. Do that for a few seconds and it should lower. if it fails the first day time a couple more times and that should do the trick