Has anyone ever been through such situation?

I have 2.5 years experience in software testing. Last week, I resigned my first company. I got the job in new company. It has been a week since I joined. I can’t concentrate here since the reminiscence of my first company don’t let me work. The new company is smaller than earlier. There is a guy who is junior and I am the other who is the senior. The entire responsibility is on me now. There are 5 to 6 projects are in progress, I am new to this type of projects. I get demoralized, when anyone says to me, “You will be responsible for this”.
I have never had such type of pressurized situations before. This new company has its new offices both are in different cities. Actually, on first day,the project manager from the office where I work right now told me, “We will have to go at other this Friday office for training ”. I said, “Yes. I don’t have any problem to come with you at new office.” So, Finally we went to new office and met one guy who is leads our team from there. Just prior to training he asked me one basic question and I couldn’t answer the question.He might have been angry with me, he said, “Having 2.5 experience and you don’t know the basic things” Actually, I knew the answer but I couldn’t answer, don’t know why?. Then, he focused more on junior he made him fully impressed. He was looking at him only not at me. I was very very demoralized. I have lost my confidence totally. I don’t want to stay here but I have to stay as I don’t have other offer. I was a bad day for me. How can I get out of it?. I think they are expecting too much from me.
My position in previous company was very good. They valued me, I valued them. They still value me and I too.