if your seat is sloping downward and not flat that would put more strain on your elbow.
if your stem is to long and this makes you lock your elbows that would put more strain on your elbows.
if your seat is to far back and this is making you lock your elbows....

don't lock elbow..like above...try and check for the above in this post and the others above...
and for now ... ice and take an anti-infalm ... and you can get elbow strap from right aid...