Diarrhea pushed back and I feel defeated

Male, 28 years old, 1.69cm

During this year I decided to gain weight. I have being doing heavy weights at home and started eating like a maniac. From January to August I made a dirty bulk, managed to go from 59kg to 69kg, but gain love handles and lost a little bit of neck. My girlfriend was not happy with the results, but I loved that everyone who saw me always tell me "hey! you've gained weight!". I was super proud. Also my weightlifting numbers where going up.

I decided to do a small cut and then try to up calories in a more healthy way. I went down to 65kg and, since I kept doing weights, my body looked great! Even if I was smaller I looked really good. I was starting to go into a clean bulk this month when I got a massive stomach sickness.

In this 4 days of diarrhea I have lost 5 kilograms. I'm at 60kg again. My body look so soft and weak. I feel like all that training and eating has been for nothing. Even when I went to 65kg people at my new job told me I looked like a kid a couple of times, it was fine since they had only seen me with cloths on. But now I truly feel back to square 1.

I was waiting for January to make a post about "my 1 year weightgain development". I had taken pictures each month. Now I feel the result will be shit. Have any of you had to deal with a major step back in your journey?