This is not an uncommon problem after years of acrylics, so don't worry you are not alone. Using a good quality nail and cuticle oil will help so apply as often as you can. The actual structure of your nail has been damaged by the acrylic nail application so it's really important to use a nail treatment specifically created for weak nails that split easily. You can wear treatment varnishes on their own or as a base coat under coloured varnish. Leighton Denny Bio-Build nail serum and shield are the perfect treatment to help build and protect your weak nails.
Having regular manicures is the best way to keep your nails looking groomed and at their best but make sure your manicurist is using acetone free nail varnish remover as those containing acetone can be very drying to your nails. Keeping your nails short and neat whilst you build up their strength will help to avoid splitting and tearing.
Remember to always wear gloves when doing the washing up, gardening or in the cold. And finally take a good quality supplement for hair, skin and nails for at least 2 months to see the improvement in your nail structure.