What seems to be the problem with my '94 Toyota Celica?

I had a new clutch kit put into my Celica about a year ago. However, now it has developed another problem. The symptoms are:
– unable to shift into third gear
– high-pitched whine when driving in second, fourth and fifth gears
– in low gears (one and two), and at low speeds (ie- in a parking lot) something under the hood sounds like it’s loose and rattling… but only at low speeds
– the smell of burning, though not of a fluid. it almost smells as if the gears are grinding

Any suggestions will be greatly appreciated.

Thanks.