Text: my doctor first prescribed a different antibiotic to clear up my mastitis, but i had severe side effects and we have to look for an alternative.

Correct capitalization: My doctor first prescribed a different antibiotic to clear up my mastitis, but I had severe side effects and we have to look for an alternative.

Text: to destroy enemy ships [...]

Correct capitalization: To destroy enemy ships [...]

Text: this same formula has been used and tested by fluke's own service labs.

Correct capitalization: This same formula has been used and tested by Fluke's own service labs.

Text: for example their method of the hypercircle appears in a joint paper in that journal in 1947.

Correct capitalization:
For example their method of the hypercircle appears in a joint paper in that journal in 1947.