As someone who has had an unfortunate number of blockages (assuming most of them due to adhesions since I recently had 8 bands of adhesions removed), mine did not start until 3 years after takedown. I've had them chronically the last couple years. Each of my blockage presented themselves differently. With all of the ones resulting in vomiting, I ended up in the hospital. I've had instances similar to yours (without the vomiting), but I honestly think it was more backup/constipation in my case. I was actually back in the hospital again this week with what I thought was a partial obstruction, but it ended up being 5 days of severe diarrhea that we could not find a cause for.