Hello,
Before anything else, please note:
1) a shared server and Drupal don't go too well together, especially if your site has a lot of content/traffic
2) you should immediately consider upgrading/changing the host (I can suggest some VERY reliable, powerful yet inexpensive options, regardless of whether you award me the job or not)
I don't think I can help fix your problem within the (very) restrictive environment of a shared host, and in all probability, nor can anyone else.
Having said that, I'll be happy to work with you to arrive at a totally satisfactory, long-term solution to your problem.
Kindly review my profile and if you find me suitable for the job, please message me here for further discussion.
With best regards,
Richa Varma
BE(IT), MBA(Marketing)
Freelancing Web Dev/Tech WAHM