Why do I feel so off? (Long)

Lily-Anne
Sometime in late August of 2015 I came off of the pill (Yasmin) for trial reasons, and it was the worst few months of my life basically. I started Dianette in October or November I think but reacted badly to it and so stopped taking it. 
I then stopped taking any type of pill, and tried to control my periods naturally, by eating healthy, doing more excercise, yet not only did I feel awful, but it did not help my skin or my menstrual cycle. 
I was have unprotected sex, but I honestly did not think anything of it as I was so sure I wasn't ovulating. I wasn't worried about that. 
I had a period on the 6th of January 2016, and that was my last natural period. 
I did not have a period in February or March, and I felt so off, so out of body and strange. 
I was getting many pregnancy symptoms that I would always put down to my period coming, if I felt sick I put it down to something bad I had ate, if I was peeing more than normal I would simply put it down to me drinking more water. 
Soon my mum started questioning me whenever I would complain about feeling sick or when I stated that I needed a new bra because my boobs had gotten to sore to wear my usual ones. 
On March 12th I went back on the pill (Cilest) with the doctors orders, but the symptoms never went away. 
In fact, some have gotten worse (peeing frequently, sore boobs, fatigue) and some have died down quite a bit (sickness). 
I managed to get a pregnancy test with my sister on April 1st, but took it on the 2nd (Saturday morning) and it was a negative. 
I had a withdrawal bleed on April 7th and instantly assumed that I was not pregnant, and tried to forget about all of the symptoms. 
Lately though things have gotten really bad, I don't feel like myself at all and I am so sure something is wrong. I don't want to go to the doctor and tell him I think I'm pregnant when I've gotten a negative test and have had a withdrawal bleed, that would be crazy. 
I'm just tired of feeling like I am pregnant when it's quite obvious I am not. 
Should I try to ignore it or should I see a doctor? 
I don't know what to do anymore. 

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