Low blood pressure and slow heart rate mystery. Help!!

To begin, I'm 18, female, 176cm & 67kg.
Blood pressure 95/60.
Resting heart rate: 35-45ish
The past few months I have been feeling exhausted, nauseas & faint. To the point where I quit my part time job because I couldn't manage it as well as Uni. The past 2 weeks I have got worse and my symptoms have increased. I now am so exhausted I'm bed ridden, faint, dizzy, heavy legs, short of breath, not tight chest but feel restricted, arms/legs fall asleep easily, headaches, struggle walking up hills, warm body temp. The list goes on.

I have been to the doctor and a heart specialist but they seem to think nothing is wrong? They claim that my low heart rate is because I am athletic, they just assume I am athletic also. I do go to the gym 5-6x's a week but I do strength training & toning. My cardio is a 30 minute walk in the morning. I'm slim but I wouldn't class myself as overly fit & definitely not athletic.
They also never seem to question my (in my opinion) extremely low blood pressure.
Just wondering if anyone else has similar problems and solutions.
I'm not sold on the "you feel as if you're almost dead because you're TOO healthy" explanation I seem to be getting.
Should I be searching for more opinions? Or am I over reacting?

Hey LB,

I am so sorry your having these problems. To decline as much as you have is extremely concering. I strongly recommend you seek another opinion or cardiac specialist. If your seriously bed ridden now then you really should be in the hospital. What you have described is serious to the point it has drastically effected your daily life.  Please keep posting & letting us know how your doing.