Age 19 has been rough for Justin Bieber so far. After his 19th birthday bash in London last Saturday didn't go as planned, troubles across the pond have continued for the pop singer. Thursday night, for example, the Biebs ended up in the hospital following an onstage collapse at his concert. And if a hospital visit wasn't dramatic enough, the young star went into a yelling rage at a paparazzo early Friday morning.

Here's Bieber's explanation of his eventful Thursday night into Friday morning via his tweets.

Justin's night starts off drama-free as he prepares for his third London tour date...

Day 3. London. O2. #BELIEVEtour

— Justin Bieber (@justinbieber) March 7, 2013

After collapsing onstage, the Biebs reassures fans that he's doing well, just tired...

getting better. thanks for everyone pulling me thru tonight. best fans in the world. figuring out what happened. thanks for the love

— Justin Bieber (@justinbieber) March 8, 2013

Following his long night at the hospital, the drama increased when Bieber got into an altercation with a paparazzo...

Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me...

— Justin Bieber (@justinbieber) March 8, 2013

Rough night, rough week... Bieber explains to his fans why he lost his cool...

Sometimes when people r shoving cameras in your face all day and yelling the worst thing possible at u...well I'm human. Rough week

— Justin Bieber (@justinbieber) March 8, 2013

Not gonna let them get the best of me again. Gonna get focused on this show tonight. Adrenaline is high now. Gonna put it on the stage

— Justin Bieber (@justinbieber) March 8, 2013

Only way someone can break u is if u let them.

— Justin Bieber (@justinbieber) March 8, 2013

All seems to be well in Bieber's world as he prepares to take the stage for his final London performance tonight...

Night 4. O2. London. #BELIEVEtour

— Justin Bieber (@justinbieber) March 8, 2013