What is the best way to manage several workloads. I get overwhelmed and excessively nervous when I have so much workload that I spend time trying to calm myself than actually getting the work done.

Make a to do this, then set an alarm for each task on the list.

Having a physical planner helped me, but mostly utilizing an alarm on my phone to have a reminder helped me to be successful.

Thank you for sharing this, Damilola; I understand how challenging the final year in college can be. When it comes to managing a heavy workload, the quickest way to reduce stress is to "prioritize and organize;" meaning, you first need to break down the main workload into smaller, individual tasks. Then each task can be completed, one at a time, in order of importance. This will help make the workload seem a lot less overwhelming.

First, think about your daily schedule. In addition to your school work, are you involved in any additional activities outside of school? How many hours a week do you spend on those additional activities? Next, think about your graduation date. How many credit hours do you have remaining on your degree? Are you planning to break up these hours into two semesters, or do you plan to take summer or winter classes as well? Take a moment to write all of this down, morning to evening, so you can see your daily schedule on paper.

Now that you've written out your schedule, determined your hours in school and outside of school, and looked at the individual tasks you need to complete, write out a list of daily goals to achieve, so you can utilize each day wisely.

For example:
Monday 9am - class (paper due next Monday)
11am - class (test this Friday)
1pm-5pm - work (need to dry clean uniform)
6pm - class (need to read 2 chapters)
8pm - reading group (need to prepare notes)

As you can see, the most immediate need you have is to read the chapters for class at 6pm. Then, you need to prepare notes for tonight's reading group. Next, you need to take your work uniform to the dry cleaner's. Then, you need to prepare for your test at the end of the week, and last, write your paper for next week. Each item is important, but now you've given yourself individual tasks, and a prioritized timeline to complete them. Make sense? Hope this helps!

Do you use a planner or notebook system? If not you should definitely look into starting.
When managing multiple tasks I find it helpful to break the tasks up. Write down everything you have to do and then prioritize the items that need to be done immediately, things that need to be done over the next few days and longer term items.
http://lifehacker.com/5270297/quickly-prioritize-your-tasks-by-urgency-and-importance
This a link to a good task prioritization tool.

Best of luck,