Make the following sentence more concise.
I have a really bad cold and it is making me feeling really miserable.
I have a terrible cold that's making me miserable.
Complete the following task based on the instruction and optional input provided.### Instruction:
Make the following sentence more concise.

### Input:
I have a really bad cold and it is making me feeling really miserable.

### Output:
I have a terrible cold that's making me miserable.