Hi Rakesh,
I see that there is no point in asking for your rights to continue with them anymore. But since they have terminated you, pls ask them for the final settlement, and keep moving.
Reason for termination may be: a) They found someone for a better pay b) OR they were desperately in need of someone for that posting of yours, and did not find anyone really good at that point. They felt you were average and hired you to put the fire off. And later, they came across this new candidate who seemed to be just the right person whom they were lookign at, and they had no choice - had to hire him. c) OR - they felt it will take time and investment to train you, and they had no choice because of falling profits - but hire another person who maybe much experienced than you.
It happens - not just in export industry---but across all industries.
Regarding your next job:
Please check if the company that you are being offered a job, has the ability to pay you the salary that fits your profile.
When you do a salary negotiation, cleraly tell them that, you owuld like the range to be within the company standards. Becuase if its not within teh company standards and if they are lookign to hire you just to put away the fire at the moment, then you need to tell them that you are looking for a long term relation, and not that of a short lived one.
Depression is one thing that stops anyone from thinking forward - I dont know, its like a sympton in which - you are not able to look at the brighter side - I cant tell you to stop being depressed, because, I know the difficulty in coming out of it.
I have also been through major depression in my life - and I can confidently say that, once you see the light and the opportunity thats waiting behind door, one day you will turn back and see how much these incidents in life has taught us to be careful while choosing and making life's important choices. Now to make this door visible to your eyes - stop playing the past in your head. Be confident - the hand that held you until now, knows how to lead you forever.
Life is 10% of what happens to you, and 90% of what you make out of it!
Good Luck!