Heart Failure Support Group
Heart failure is a condition that can result from any structural or functional cardiac disorder that impairs the ability of the heart to fill with or pump a sufficient amount of blood throughout the body. It is often undiagnosed due to a lack of a universally agreed definition and difficulties in diagnosis, particularly when the condition is considered "mild."

Have to measure your BP??
The times that I feel like that are for 2 reasons, either my BP has going too low for what I am used to or I have entered in a Low cardiac output syndrome.
In the first case, a few grains of salt and a glass of water, usually helps.
The low output is something that can upset anyone the first time that it happens but , I have learned to feel it when it is about to happen and I prevent it before happening just by resting horizontally for a while. When it hits me, the feeling is that all my body has lost its strength, it is hard to recognized myself in a mirror because the muscles in my face has lost any tone and if I do not look rapidly for a chair or a bed, I just fall down.
Do not despair, ... it will be better days.
Jesus
Just a little comment to suggest, in addition to jesus ideas, yo might benefit from a few vitamins - I know they have helped me a lot
I take B12 - about 2x
and COQ10 - 150 mg per day - good to help heart repain itself.
and Vitamin D - 2400 IU per day with 1400 mg calcium - I am deficient in vitamin D otherwise 400 to 800 would be more than enough.
Hope these give you some ideas.
Hugs, Raoul
Today I have been thinking about you all the morning... as every Sunday my alarm clock rng at 7 to remember me that I have to take my strong diuretic... normally it gets about 1kg of water out of my body in 2-3 hours what allows me to have my lungs clean for the next week.
When I took my BP at 9am, as every day, it was 87/45 ... and I remember you while doing what seemed to be an impossible task : to put the socks and to tie the shoes. And then I went into taking my BB and ACE Inhibitor to control the BP!!!
By the way, here in Europe we also have another remedy for that , a cup of good, STRONG black coffee!!! :) :)
Now is 13:30 and I am back to live... ready to cook a good marinate tuna to my wife....
Jesus