Syncope, Vertigo Negative, Eye Sore, Teary, Muscle Weakness, BP Drop

I ve experienced syncophe 4 times already. I consulted with my ENT to check if it s vertigo but after several tests, all are negative. He then referred to an Optalmologist for my eyes sore at times and is teary, but after the test, he got negative results as well. Since Ive mentioned that I sometimes passed out, my muscles weakens and that my BP drops down dramatically he said it is syncophe and should try consulting a cardiologist . Now, I had undergone holter monitoring and stress test, both are normal. The cardio then asked me again to have a complete blood work out, ECG , and 2 d echo. I really dont know what s happening, even the doctors are asking questions where is the syncophe coming from? Is it really not vertigo?