Really dizzy & this weird sound in my right ear. It's feels like I am hearing heart beat but it's a muffle. Like when you listen to a baby's heart beat?

Vertigo. Dizziness caused by inner ear problems. See your doctor for evaluation and treatment.
Vertigo. Sounds like you have developed vertigo, and I think likely from fluid on your ear. This explains why you are hearing your heart beat and the fluid will cause a pressure change that can refer to your balance gland. Get checked!
See an ENT. Some toxin, pathogen or allergen is most likely causing the weird sensations in the ear or the TM joint. Also possible vascular issue.