Helo Doctor, When I Get Up After A Deep Sleep

Helo Doctor, When I get up after a deep sleep , i smell some odor which is just like that of semen , But i can not observe any kinds of signs of semen on my trouser, . If i sleep after putting a condom on my penis i don't smell any odor. I have been masturbating for a very long time. I thinks it is leakage of semen when i sleep . I am losing my weight and becoming very very weak. what could be the problem ? I have applied local medicines but no difference was observed.