It's easy to carry on in your usual routine at work not thinking about how things could be made easier with only small adjustments. Some people find simple things like adjusting screen brightness on computers can help, others find that ensuring they take regular short breaks help.
Although you may not count yourself as 'disabled' by having multiple sclerosis (MS) you are covered under the Disability Discrimination Act and could get help with getting adjustments at work.
You can contact the Disability Employment Adviser (DEA) at the local Job Centre who will be able to advise you and your employer on the different options open to you.
Things like the Access to Work scheme can provide some practical and financial support.
Being diagnosed with MS may mean that you are eligible for benefits and these tests assess your ability to work, and are used to decide whether you qualify for benefits including Incapacity Benefit. The Own Occupation test is for people who have worked recently, whereas if you are no longer working you will have to take a Personal Capability Assessment.
Visit the main MS Society site for more information.